Message configuration for two-step random access procedure

ABSTRACT

Methods, systems, and devices for wireless communications are described that relate to a two-step random access procedure. Generally, the described techniques allow different configurations for a first message of a random access procedure depending on a connected-state of the user equipment (UE) performing the random access procedure. A base station may transmit configuration information to the UE and the UE may use the configuration information to determine resources, coding, block size, or other factors for transmitting the first message based on the radio resource control (RRC) connected state of the UE. The UE may then monitor for a random access response from the base station based on the first message from the UE.

CROSS REFERENCE

The present application for patent is a Continuation of U.S. patentapplication Ser. No. 17/023,840 by LEI et al., entitled “MESSAGECONFIGURATION FOR TWO-STEP RANDOM ACCESS PROCEDURE” filed Sep. 17, 2020,which claims the benefit of U.S. Provisional Patent Application No.62/902,230 by LEI et al., entitled “MESSAGE CONFIGURATION FOR TWO STEPRANDOM ACCESS PROCEDURE,” filed Sep. 18, 2019, each of which areassigned to the assignee hereof, and each of which are expresslyincorporated by reference herein.

FIELD OF TECHNOLOGY

The following relates generally to wireless communications and morespecifically to message configuration for two-step random accessprocedure.

BACKGROUND

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). Examples of suchmultiple-access systems include fourth generation (4G) systems such asLong Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, orLTE-A Pro systems, and fifth generation (5G) systems which may bereferred to as New Radio (NR) systems. These systems may employtechnologies such as code division multiple access (CDMA), time divisionmultiple access (TDMA), frequency division multiple access (FDMA),orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonalfrequency division multiplexing (DFT-S-OFDM). A wireless multiple-accesscommunications system may include one or more base stations or one ormore network access nodes, each simultaneously supporting communicationfor multiple communication devices, which may be otherwise known as userequipment (UE).

A UE may communicate with a base station using a two-step random accessprocedure. The two-step random access procedure may decrease signalingoverhead and increase efficiency. The traffic pattern and payload sizeof random access transmissions may vary depending on the state of thenetwork, the messages being transmitted, or other factors, which maylead to inefficient resource utilization, limited signaling flexibility,or both.

SUMMARY

The described techniques relate to improved methods, systems, devices,and apparatuses that support message configuration for two-step randomaccess procedure. Generally, the described techniques allow multipleconfigurations for transmission of the first message (e.g., MsgA) of atwo-step random access procedure between a base station and a userequipment (UE). For example, a base station may transmit configurationinformation for a first message of the two-step random access procedureto the UE, where the configuration information depends on theconnected-state of the UE (e.g., idle connected-state, inactiveconnected-state, or a connected-state). The UE may use the configurationinformation to transmit the first message based on the radio resourcecontrol (RRC) state of the UE as part of the two-step random accessprocedure. The UE may then monitor for a random access response messagefrom the base station in response to the first message from the UE.

A method of wireless communications at a UE is described. The method mayinclude receiving, from a base station, configuration information for afirst message of a two-step random access procedure between the UE andthe base station, the configuration information including aconnection-state dependent element indicating that the configurationinformation corresponds to a connection-state of the UE, transmitting,to the base station and based on a current connection-state of the UEbeing the connection-state of the UE to which the configurationinformation corresponds, the first message of the two-step random accessprocedure, and monitoring for a second message of the two-step randomaccess procedure from the base station in response to the first message.

An apparatus for wireless communications at a UE is described. Theapparatus may include a processor, memory coupled with the processor,and instructions stored in the memory. The instructions may beexecutable by the processor to cause the apparatus to receive, from abase station, configuration information for a first message of atwo-step random access procedure between the UE and the base station,the configuration information including a connection-state dependentelement indicating that the configuration information corresponds to aconnection-state of the UE, transmit, to the base station and based on acurrent connection-state of the UE being the connection-state of the UEto which the configuration information corresponds, the first message ofthe two-step random access procedure, and monitor for a second messageof the two-step random access procedure from the base station inresponse to the first message.

Another apparatus for wireless communications at a UE is described. Theapparatus may include means for receiving, from a base station,configuration information for a first message of a two-step randomaccess procedure between the UE and the base station, the configurationinformation including a connection-state dependent element indicatingthat the configuration information corresponds to a connection-state ofthe UE, transmitting, to the base station and based on a currentconnection-state of the UE being the connection-state of the UE to whichthe configuration information corresponds, the first message of thetwo-step random access procedure, and monitoring for a second message ofthe two-step random access procedure from the base station in responseto the first message.

A non-transitory computer-readable medium storing code for wirelesscommunications at a UE is described. The code may include instructionsexecutable by a processor to receive, from a base station, configurationinformation for a first message of a two-step random access procedurebetween the UE and the base station, the configuration informationincluding a connection-state dependent element indicating that theconfiguration information corresponds to a connection-state of the UE,transmit, to the base station and based on a current connection-state ofthe UE being the connection-state of the UE to which the configurationinformation corresponds, the first message of the two-step random accessprocedure, and monitor for a second message of the two-step randomaccess procedure from the base station in response to the first message.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the configurationinformation may include operations, features, means, or instructions fordescrambling the configuration information based on a connection-statespecific radio network temporary identifier (RNTI) associated with theconnection-state of the UE, where the connection-state of the UE may beone of an RRC idle mode, an RRC inactive mode, or an RRC connected mode.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving secondconfiguration information for the first message of the two-step randomaccess procedure, where the second configuration information includes asecond connection-state dependent element indicating that the secondconfiguration information corresponds to a second connection-state ofthe UE different from the current connection-state of the UE, anddescrambling the second configuration information based on a secondconnection-state specific RNTI associated with the secondconnection-state of the UE.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for descrambling theconfiguration information based on a group specific RNTI associated withmultiple connection-states of the UE, where the multipleconnection-states include an RRC idle mode and an RRC inactive mode.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving secondconfiguration information for the first message of the two-step randomaccess procedure, where the second configuration information includes asecond connection-state dependent element indicating that the secondconfiguration information corresponds to a second connection-state ofthe UE different from the connection-state of the UE, and descramblingthe second configuration information based on a second group specificRNTI associated with the second connection-state of the UE.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the configuration informationincludes preamble resource information, physical uplink shared channel(PUSCH) resource information, transport block size (TBS), modulation andcoding scheme (MCS), waveform, demodulation reference signal (DMRS)resource information, a mapping of a preamble to a PUSCH resource unit(PRU), an association between a synchronization signal block (SSB) andpreamble occasion (RO) or PUSCH occasion (PO), or any combinationthereof.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for descrambling theconfiguration information based on a group specific RNTI associated withmultiple connection-states of the UE, where the multipleconnection-states include an RRC inactive mode and an RRC connectedmode.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving secondconfiguration information for the first message of the two-step randomaccess procedure, where the second configuration information includes asecond connection-state dependent element indicating that the secondconfiguration information corresponds to a second connection-state ofthe UE different from the current connection-state of the UE,descrambling the second configuration information based on a secondgroup specific RNTI associated with the second connection-state of theUE, selecting a value for a preamble resource, PUSCH resource, TBS, MCS,waveform, DMRS resource, a preamble to a PRU mapping, an SSB to RO or POassociation, from a union of the first and the second configurationinformation, from the second configuration information only, or from thefirst configuration information only, and applying the selected value tothe first message of the two-step random access procedure fortransmitting the first message to the base station.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for transmitting the firstmessage of the two-step random access procedure according to at least aportion of the second configuration information.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving theconfiguration information for the first message via a first signal, andreceiving a second signal different from the first signal, the secondsignal including second configuration information for the first messageof the two-step random access procedure, where the second configurationinformation includes a second connection-state dependent elementindicating that the second configuration information corresponds to asecond connection-state of the UE different from the currentconnection-state of the UE.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the second configurationinformation corresponds to multiple connection-states of the UE, each ofwhich may be different from the current connection-state of the UE.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving secondconfiguration information for the first message of the two-step randomaccess procedure, where the second configuration information includes asecond connection-state dependent element indicating that the secondconfiguration information corresponds to a second connection-state ofthe UE different from the current connection-state of the UE, andtransmitting the first message of the two-step random access procedureaccording to at least a portion of the second configuration information.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for preamble resourceinformation of the first configuration information at least partiallyoverlaps preamble resource information of the second configurationinformation, or PUSCH resource information of the first configurationinformation at least partially overlaps PUSCH resource information ofthe second configuration information, or DMRS resource information ofthe first configuration information at least partially overlaps DMRSresource information of the second configuration information, or TB Sinformation of the first configuration information at least partiallyoverlaps TBS information of the second configuration information, MCSinformation of the first configuration information at least partiallyoverlaps MCS information of the second configuration information, or amapping relation between preamble and PRU of the first configurationinformation at least partially overlaps the mapping relation betweenpreamble and PRU of the second configuration information, or anassociation pattern between SSB and RO or PO of the first configurationinformation at least partially overlaps the association pattern betweenSSB and preamble RO or PUSCH PO of the second configuration information.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving the secondconfiguration information in a signal different from the firstconfiguration information while UE may be in the current connectedstate, decoding both the second configuration information and the firstconfiguration information, and transmitting, by the UE in the currentconnected-state, the first message based on only one of the firstconfiguration information or the second configuration information.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for failing to decode thefirst configuration information while the UE may be in the currentconnected-state, and transmitting, by the UE in the currentconnected-state, the first message based on the second configurationinformation corresponding to the second connection-state of the UE.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving systeminformation that indicates second configuration information for thefirst message of the two-step random access procedure, where the secondconfiguration information includes a second connection-state dependentelement indicating that the second configuration information correspondsto a second connection-state of the UE different from theconnection-state of the UE, receiving RRC signaling that includes theconfiguration information corresponding to the second connection-stateof the UE, and transmitting the first message of the two-step randomaccess procedure according to the configuration information independentof the system information.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for determining the currentconnection-state of the UE as one of an RRC idle mode, an RRC inactivemode, or an RRC connected mode.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving theconfiguration information via an SSB, a SIB, a paging message, an RRCmessage, or any combination thereof.

A method of wireless communications at a base station is described. Themethod may include transmitting, to a UE, configuration information fora first message of a two-step random access procedure between the UE andthe base station, the configuration information including aconnection-state dependent element indicating that the configurationinformation corresponds to a connection-state of the UE, receiving, fromthe UE and based on a current connection-state of the UE being theconnection-state of the UE to which the configuration informationcorresponds, the first message of the two-step random access procedure,and transmitting a second message of the two-step random accessprocedure to the UE in response to the first message.

An apparatus for wireless communications at a base station is described.The apparatus may include a processor, memory coupled with theprocessor, and instructions stored in the memory. The instructions maybe executable by the processor to cause the apparatus to transmit, to aUE, configuration information for a first message of a two-step randomaccess procedure between the UE and the base station, the configurationinformation including a connection-state dependent element indicatingthat the configuration information corresponds to a connection-state ofthe UE, receive, from the UE and based on a current connection-state ofthe UE being the connection-state of the UE to which the configurationinformation corresponds, the first message of the two-step random accessprocedure, and transmit a second message of the two-step random accessprocedure to the UE in response to the first message.

Another apparatus for wireless communications at a base station isdescribed. The apparatus may include means for transmitting, to a UE,configuration information for a first message of a two-step randomaccess procedure between the UE and the base station, the configurationinformation including a connection-state dependent element indicatingthat the configuration information corresponds to a connection-state ofthe UE, receiving, from the UE and based on a current connection-stateof the UE being the connection-state of the UE to which theconfiguration information corresponds, the first message of the two-steprandom access procedure, and transmitting a second message of thetwo-step random access procedure to the UE in response to the firstmessage.

A non-transitory computer-readable medium storing code for wirelesscommunications at a base station is described. The code may includeinstructions executable by a processor to transmit, to a UE,configuration information for a first message of a two-step randomaccess procedure between the UE and the base station, the configurationinformation including a connection-state dependent element indicatingthat the configuration information corresponds to a connection-state ofthe UE, receive, from the UE and based on a current connection-state ofthe UE being the connection-state of the UE to which the configurationinformation corresponds, the first message of the two-step random accessprocedure, and transmit a second message of the two-step random accessprocedure to the UE in response to the first message.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for scrambling theconfiguration information based on a connection-state specific RNTI,where the connection-state specific RNTI may be associated with one ofan RRC idle mode, an RRC inactive mode, or an RRC connected mode, andscrambling second configuration information for the first message of thetwo-step random access procedure based on a second connection-statespecific RNTI different from the connection-state specific RNTI, wherethe second configuration information includes a second connection-statedependent element indicating that the second configuration informationcorresponds to a second connection-state of the UE different from theconnection-state of the UE.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for scrambling theconfiguration information based on a group specific RNTI, where thegroup specific RNTI may be associated with both an RRC idle mode and anRRC inactive mode.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for scrambling theconfiguration information based on a group specific RNTI, where thegroup specific RNTI may be associated with both an RRC inactive mode andan RRC connected mode.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for transmitting theconfiguration information for the first message via a first signal, andtransmitting a second signal different from the first signal, the secondsignal including second configuration information for the first messageof the two-step random access procedure, where the second configurationinformation includes a second connection-state dependent elementindicating that the second configuration information corresponds to asecond connection-state of the UE different from the connection-state ofthe UE.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the second configurationinformation corresponds to multiple connection-states of the UE, and thesecond configuration information may be different from the firstconfiguration information for TBS, MCS, DMRS resource, preambleresource, PUSCH resource, preamble to PRU mapping, SSB to preamble RO orPO association, or any combination thereof.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, a preamble resource of thefirst configuration information overlaps a preamble resource of a secondconfiguration information, where the second configuration informationincludes a second connection-state dependent element indicating that thesecond configuration information corresponds to a secondconnection-state of the UE different from the current connection-stateof the UE.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, one or multiple values of thefirst configuration information overlaps with one or multiple values ofa second configuration information for TBS, MCS, DMRS resource, preambleresource, PUSCH resource, preamble to PRU mapping, SSB to preamble RO orPO association, or any combination thereof, and where the secondconfiguration information includes a second connection-state dependentelement indicating that the second configuration information correspondsto a second connection-state of the UE different from the currentconnection-state of the UE.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the current connection-stateof the UE as one of an RRC idle mode, an RRC inactive mode, or an RRCconnected mode.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for transmitting theconfiguration information via an SSB, a SIB, a paging message, an RRCmessage, or any combination thereof.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the configuration informationincludes preamble resource information, PUSCH resource information, TBS,MCS, waveform, DMRS resource information, a mapping of a preamble to aPRU, an association between an SSB and RO or PO, or any combinationthereof.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a wireless communications system thatsupports message configuration for two-step random access procedure inaccordance with aspects of the present disclosure.

FIG. 2 illustrates an example of a wireless communications system thatsupports message configuration for two-step random access procedure inaccordance with aspects of the present disclosure.

FIG. 3 illustrates an example of a process flow that supports messageconfiguration for two-step random access procedure in accordance withaspects of the present disclosure.

FIGS. 4 and 5 show block diagrams of devices that support messageconfiguration for two-step random access procedure in accordance withaspects of the present disclosure.

FIG. 6 shows a block diagram of a communications manager that supportsmessage configuration for two-step random access procedure in accordancewith aspects of the present disclosure.

FIG. 7 shows a diagram of a system including a device that supportsmessage configuration for two-step random access procedure in accordancewith aspects of the present disclosure.

FIGS. 8 and 9 show block diagrams of devices that support messageconfiguration for two-step random access procedure in accordance withaspects of the present disclosure.

FIG. 10 shows a block diagram of a communications manager that supportsmessage configuration for two-step random access procedure in accordancewith aspects of the present disclosure.

FIG. 11 shows a diagram of a system including a device that supportsmessage configuration for two-step random access procedure in accordancewith aspects of the present disclosure.

FIGS. 12 through 15 show flowcharts illustrating methods that supportmessage configuration for two-step random access procedure in accordancewith aspects of the present disclosure.

DETAILED DESCRIPTION

A UE may communicate with a base station serving a cell by establishinga connection with the base station using a two-step random accessprocedure. The two-step random access procedure may involve messagestransmitted via the random access channel (RACH) in which a userequipment (UE) transmits one or more signals in order to facilitatecommunication with a base station without prior scheduling. For example,rather than communicating on resources allocated (e.g., by the basestation) for the UE, the UE may establish communication with the basestation through transmissions via the RACH, a channel for non-scheduledcommunications, and the base station may schedule resources for the UEor may allow the UE to utilize unscheduled resources for communication.

Once powered on, a UE in a wireless communications system, may operatein a given mode or connected-state such as an idle radio resourcecontrol (RRC) state (RRC IDLE), an inactive RRC state (RRC INACTIVE), ora connected RRC state (RRC CONNECTED). These states may correspond tothe state of the UE and its connection to the network with respect towhether RRC connection setup has occurred (RRC CONNECTED), has beensuspended (RRC INACTIVE), or has not yet been establish or has beenreleased (RRC IDLE). The RRC idle may occur in cases where a UE receivesan RRC release message from a base station, which may be based on a cellreselection or other reconnection process by the UE or the base station.RRC inactive may occur in cases where a UE receives an RRC suspendmessage, while RRC connected may occur in cases where a UE receives anRRC connection establishment confirmation.

In a two-step random access procedure, a UE may transmit a first randomaccess message (e.g., Msg1 or MsgA), which may include a preamble forinitiating communication with a base station. The transmission of thefirst random access message by the UE may be impacted by the RRC stateof the UE and the network. For example, the traffic pattern andpotential payload size of the first random access message may depend onthe RRC state, due to the distinctive type of connection, registration,and session management information corresponding to the RRC stated andmanaged by the core network. The varying traffic pattern and payloadsize of the first random access message transmitted by the UE maydecrease efficiency and overuse resource allocation.

In order to improve signaling flexibility and resource utilization, thebase station may periodically transmit configuration information to oneor more UEs in the network. In some cases, random access messageconfigurations may be configured by the base station and may vary basedon the connected-state (e.g., the RRC state) of the UE. For example,configuration information for idle and inactive RRC states may betransmitted in synchronization signal block (SSB) configurationinformation, paging information, or in a system information block (SIB)and configuration information corresponding to RRC connected state maybe transmitted by the base station in RRC signaling, SSB configurationinformation, or in a SIB.

The random access configuration information transmitted by the basestation may include a set of information elements (IEs). Each IE mayindicate configuration information that the UE may use for transmissionof the random access preamble or payload of the first message. Theconfiguration information may be transmitted by different downlinksignaling (e.g., SIB, SSB, or RRC) depending on the RRC state of the UE,and may also indicate different configurations (e.g., differentconfiguration information or different values for one or more of theIEs) depending on the RRC state of the UE. In some examples, theconfiguration information may be scrambled differently depending on theRRC state (e.g., configuration information for RRC inactive may bescrambled differently than configuration information for RRC connected),and may, additionally or alternative, be transmitted using differentsignaling.

Based on the configuration information received from the base stationand the current RRC state of the UE, the UE may generate and transmitthe first random access message as part of the two-step random accessprocedure with the base station. Once transmitted, the UE may monitorfor a response from the base station, such as a Msg2 or MsgBtransmission from the base station in response to the first message.

Aspects of the disclosure are initially described in the context ofwireless communications systems. Aspects of the disclosure are thendescribed in the context of a process flow. Aspects of the disclosureare further illustrated by and described with reference to apparatusdiagrams, system diagrams, and flowcharts that relate to messageconfiguration for two-step random access procedure.

FIG. 1 illustrates an example of a wireless communications system 100that supports message configuration for two-step random access procedurein accordance with aspects of the present disclosure. The wirelesscommunications system 100 may include one or more base stations 105, oneor more UEs 115, and a core network 130. In some examples, the wirelesscommunications system 100 may be a Long Term Evolution (LTE) network, anLTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR)network. In some examples, the wireless communications system 100 maysupport enhanced broadband communications, ultra-reliable (e.g., missioncritical) communications, low latency communications, communicationswith low-cost and low-complexity devices, or any combination thereof.

The base stations 105 may be dispersed throughout a geographic area toform the wireless communications system 100 and may be devices indifferent forms or having different capabilities. The base stations 105and the UEs 115 may wirelessly communicate via one or more communicationlinks 125. Each base station 105 may provide a coverage area 110 overwhich the UEs 115 and the base station 105 may establish one or morecommunication links 125. The coverage area 110 may be an example of ageographic area over which a base station 105 and a UE 115 may supportthe communication of signals according to one or more radio accesstechnologies.

The UEs 115 may be dispersed throughout a coverage area 110 of thewireless communications system 100, and each UE 115 may be stationary,or mobile, or both at different times. The UEs 115 may be devices indifferent forms or having different capabilities. Some example UEs 115are illustrated in FIG. 1 . The UEs 115 described herein may be able tocommunicate with various types of devices, such as other UEs 115, thebase stations 105, or network equipment (e.g., core network nodes, relaydevices, integrated access and backhaul (IAB) nodes, or other networkequipment), as shown in FIG. 1 .

The base stations 105 may communicate with the core network 130, or withone another, or both. For example, the base stations 105 may interfacewith the core network 130 through one or more backhaul links 120 (e.g.,via an S1, N2, N3, or other interface). The base stations 105 maycommunicate with one another over the backhaul links 120 (e.g., via anX2, Xn, or other interface) either directly (e.g., directly between basestations 105), or indirectly (e.g., via core network 130), or both. Insome examples, the backhaul links 120 may be or include one or morewireless links.

One or more of the base stations 105 described herein may include or maybe referred to by a person having ordinary skill in the art as a basetransceiver station, a radio base station, an access point, a radiotransceiver, a NodeB, an eNodeB (eNB), a next-generation NodeB or agiga-NodeB (either of which may be referred to as a gNB), a Home NodeB,a Home eNodeB, or other suitable terminology.

A UE 115 may include or may be referred to as a mobile device, awireless device, a remote device, a handheld device, or a subscriberdevice, or some other suitable terminology, where the “device” may alsobe referred to as a unit, a station, a terminal, or a client, amongother examples. A UE 115 may also include or may be referred to as apersonal electronic device such as a cellular phone, a personal digitalassistant (PDA), a tablet computer, a laptop computer, or a personalcomputer. In some examples, a UE 115 may include or be referred to as awireless local loop (WLL) station, an Internet of Things (IoT) device,an Internet of Everything (IoE) device, or a machine type communications(MTC) device, among other examples, which may be implemented in variousobjects such as appliances, or vehicles, meters, among other examples.

The UEs 115 described herein may be able to communicate with varioustypes of devices, such as other UEs 115 that may sometimes act as relaysas well as the base stations 105 and the network equipment includingmacro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations,among other examples, as shown in FIG. 1 .

The UEs 115 and the base stations 105 may wirelessly communicate withone another via one or more communication links 125 over one or morecarriers. The term “carrier” may refer to a set of radio frequencyspectrum resources having a defined physical layer structure forsupporting the communication links 125. For example, a carrier used fora communication link 125 may include a portion of a radio frequencyspectrum band (e.g., a bandwidth part (BWP)) that is operated accordingto one or more physical layer channels for a given radio accesstechnology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layerchannel may carry acquisition signaling (e.g., synchronization signals,system information), control signaling that coordinates operation forthe carrier, user data, or other signaling. The wireless communicationssystem 100 may support communication with a UE 115 using carrieraggregation or multi-carrier operation. A UE 115 may be configured withmultiple downlink component carriers and one or more uplink componentcarriers according to a carrier aggregation configuration. Carrieraggregation may be used with both frequency division duplexing (FDD) andtime division duplexing (TDD) component carriers.

In some examples (e.g., in a carrier aggregation configuration), acarrier may also have acquisition signaling or control signaling thatcoordinates operations for other carriers. A carrier may be associatedwith a frequency channel (e.g., an evolved universal mobiletelecommunication system terrestrial radio access (E-UTRA) absoluteradio frequency channel number (EARFCN)) and may be positioned accordingto a channel raster for discovery by the UEs 115. A carrier may beoperated in a standalone mode where initial acquisition and connectionmay be conducted by the UEs 115 via the carrier, or the carrier may beoperated in a non-standalone mode where a connection is anchored using adifferent carrier (e.g., of the same or a different radio accesstechnology).

The communication links 125 shown in the wireless communications system100 may include uplink transmissions from a UE 115 to a base station105, or downlink transmissions from a base station 105 to a UE 115.Carriers may carry downlink or uplink communications (e.g., in an FDDmode) or may be configured to carry downlink and uplink communications(e.g., in a TDD mode).

A carrier may be associated with a particular bandwidth of the radiofrequency spectrum, and in some examples the carrier bandwidth may bereferred to as a “system bandwidth” of the carrier or the wirelesscommunications system 100. For example, the carrier bandwidth may be oneof a number of determined bandwidths for carriers of a particular radioaccess technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz(MHz)). Devices of the wireless communications system 100 (e.g., thebase stations 105, the UEs 115, or both) may have hardwareconfigurations that support communications over a particular carrierbandwidth or may be configurable to support communications over one of aset of carrier bandwidths. In some examples, the wireless communicationssystem 100 may include base stations 105 or UEs 115 that supportsimultaneous communications via carriers associated with multiplecarrier bandwidths. In some examples, each served UE 115 may beconfigured for operating over portions (e.g., a sub-band, a BWP) or allof a carrier bandwidth.

Signal waveforms transmitted over a carrier may be made up of multiplesubcarriers (e.g., using multi-carrier modulation (MCM) techniques suchas orthogonal frequency division multiplexing (OFDM) or discrete Fouriertransform spread OFDM (DFT-S-OFDM)). In a system employing MCMtechniques, a resource element may consist of one symbol period (e.g., aduration of one modulation symbol) and one subcarrier, where the symbolperiod and subcarrier spacing are inversely related. The number of bitscarried by each resource element may depend on the modulation scheme(e.g., the order of the modulation scheme, the coding rate of themodulation scheme, or both). Thus, the more resource elements that a UE115 receives and the higher the order of the modulation scheme, thehigher the data rate may be for the UE 115. A wireless communicationsresource may refer to a combination of a radio frequency spectrumresource, a time resource, and a spatial resource (e.g., spatial layersor beams), and the use of multiple spatial layers may further increasethe data rate or data integrity for communications with a UE 115.

One or more numerologies for a carrier may be supported, where anumerology may include a subcarrier spacing (0 f) and a cyclic prefix. Acarrier may be divided into one or more BWPs having the same ordifferent numerologies. In some examples, a UE 115 may be configuredwith multiple BWPs. In some examples, a single BWP for a carrier may beactive at a given time and communications for the UE 115 may berestricted to one or more active BWPs.

The time intervals for the base stations 105 or the UEs 115 may beexpressed in multiples of a basic time unit which may, for example,refer to a sampling period of T_(s)=1/(Δf_(max)·N_(f)) seconds, whereΔf_(max) may represent the maximum supported subcarrier spacing, andN_(f) may represent the maximum supported discrete Fourier transform(DFT) size. Time intervals of a communications resource may be organizedaccording to radio frames each having a specified duration (e.g., 10milliseconds (ms)). Each radio frame may be identified by a system framenumber (SFN) (e.g., ranging from 0 to 1023).

Each frame may include multiple consecutively numbered subframes orslots, and each subframe or slot may have the same duration. In someexamples, a frame may be divided (e.g., in the time domain) intosubframes, and each subframe may be further divided into a number ofslots. Alternatively, each frame may include a variable number of slots,and the number of slots may depend on subcarrier spacing. Each slot mayinclude a number of symbol periods (e.g., depending on the length of thecyclic prefix prepended to each symbol period). In some wirelesscommunications systems 100, a slot may further be divided into multiplemini-slots containing one or more symbols. Excluding the cyclic prefix,each symbol period may contain one or more (e.g., N_(f)) samplingperiods. The duration of a symbol period may depend on the subcarrierspacing or frequency band of operation.

A subframe, a slot, a mini-slot, or a symbol may be the smallestscheduling unit (e.g., in the time domain) of the wirelesscommunications system 100 and may be referred to as a transmission timeinterval (TTI). In some examples, the TTI duration (e.g., the number ofsymbol periods in a TTI) may be variable. Additionally, oralternatively, the smallest scheduling unit of the wirelesscommunications system 100 may be dynamically selected (e.g., in burstsof shortened TTIs (sTTIs)).

Physical channels may be multiplexed on a carrier according to varioustechniques. A physical control channel and a physical data channel maybe multiplexed on a downlink carrier, for example, using one or more oftime division multiplexing (TDM) techniques, frequency divisionmultiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A controlregion (e.g., a control resource set (CORESET)) for a physical controlchannel may be defined by a number of symbol periods and may extendacross the system bandwidth or a subset of the system bandwidth of thecarrier. One or more control regions (e.g., CORESETs) may be configuredfor a set of the UEs 115. For example, one or more of the UEs 115 maymonitor or search control regions for control information according toone or more search space sets, and each search space set may include oneor multiple control channel candidates in one or more aggregation levelsarranged in a cascaded manner. An aggregation level for a controlchannel candidate may refer to a number of control channel resources(e.g., control channel elements (CCEs)) associated with encodedinformation for a control information format having a given payloadsize. Search space sets may include common search space sets configuredfor sending control information to multiple UEs 115 and UE-specificsearch space sets for sending control information to a specific UE 115.

Each base station 105 may provide communication coverage via one or morecells, for example a macro cell, a small cell, a hot spot, or othertypes of cells, or any combination thereof. The term “cell” may refer toa logical communication entity used for communication with a basestation 105 (e.g., over a carrier) and may be associated with anidentifier for distinguishing neighboring cells (e.g., a physical cellidentifier (PCID), a virtual cell identifier (VCID), or others). In someexamples, a cell may also refer to a geographic coverage area 110 or aportion of a geographic coverage area 110 (e.g., a sector) over whichthe logical communication entity operates. Such cells may range fromsmaller areas (e.g., a structure, a subset of structure) to larger areasdepending on various factors such as the capabilities of the basestation 105. For example, a cell may be or include a building, a subsetof a building, or exterior spaces between or overlapping with geographiccoverage areas 110, among other examples.

A macro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by theUEs 115 with service subscriptions with the network provider supportingthe macro cell. A small cell may be associated with a lower-powered basestation 105, as compared with a macro cell, and a small cell may operatein the same or different (e.g., licensed, unlicensed) frequency bands asmacro cells. Small cells may provide unrestricted access to the UEs 115with service subscriptions with the network provider or may providerestricted access to the UEs 115 having an association with the smallcell (e.g., the UEs 115 in a closed subscriber group (CSG), the UEs 115associated with users in a home or office). A base station 105 maysupport one or multiple cells and may also support communications overthe one or more cells using one or multiple component carriers.

In some examples, a carrier may support multiple cells, and differentcells may be configured according to different protocol types (e.g.,MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that mayprovide access for different types of devices.

In some examples, a base station 105 may be movable and thereforeprovide communication coverage for a moving geographic coverage area110. In some examples, different geographic coverage areas 110associated with different technologies may overlap, but the differentgeographic coverage areas 110 may be supported by the same base station105. In other examples, the overlapping geographic coverage areas 110associated with different technologies may be supported by differentbase stations 105. The wireless communications system 100 may include,for example, a heterogeneous network in which different types of thebase stations 105 provide coverage for various geographic coverage areas110 using the same or different radio access technologies.

The wireless communications system 100 may support synchronous orasynchronous operation. For synchronous operation, the base stations 105may have similar frame timings, and transmissions from different basestations 105 may be approximately aligned in time. For asynchronousoperation, the base stations 105 may have different frame timings, andtransmissions from different base stations 105 may, in some examples,not be aligned in time. The techniques described herein may be used foreither synchronous or asynchronous operations.

Some UEs 115, such as MTC or IoT devices, may be low cost or lowcomplexity devices and may provide for automated communication betweenmachines (e.g., via Machine-to-Machine (M2M) communication). M2Mcommunication or MTC may refer to data communication technologies thatallow devices to communicate with one another or a base station 105without human intervention. In some examples, M2M communication or MTCmay include communications from devices that integrate sensors or metersto measure or capture information and relay such information to acentral server or application program that makes use of the informationor presents the information to humans interacting with the applicationprogram. Some UEs 115 may be designed to collect information or enableautomated behavior of machines or other devices. Examples ofapplications for MTC devices include smart metering, inventorymonitoring, water level monitoring, equipment monitoring, healthcaremonitoring, wildlife monitoring, weather and geological eventmonitoring, fleet management and tracking, remote security sensing,physical access control, and transaction-based business charging.

Some UEs 115 may be configured to employ operating modes that reducepower consumption, such as half-duplex communications (e.g., a mode thatsupports one-way communication via transmission or reception, but nottransmission and reception simultaneously). In some examples,half-duplex communications may be performed at a reduced peak rate.Other power conservation techniques for the UEs 115 include entering apower saving deep sleep mode when not engaging in active communications,operating over a limited bandwidth (e.g., according to narrowbandcommunications), or a combination of these techniques. For example, someUEs 115 may be configured for operation using a narrowband protocol typethat is associated with a defined portion or range (e.g., set ofsubcarriers or resource blocks (RBs)) within a carrier, within aguard-band of a carrier, or outside of a carrier.

The wireless communications system 100 may be configured to supportultra-reliable communications or low-latency communications, or variouscombinations thereof. For example, the wireless communications system100 may be configured to support ultra-reliable low-latencycommunications (URLLC) or mission critical communications. The UEs 115may be designed to support ultra-reliable, low-latency, or criticalfunctions (e.g., mission critical functions). Ultra-reliablecommunications may include private communication or group communicationand may be supported by one or more mission critical services such asmission critical push-to-talk (MCPTT), mission critical video (MCVideo),or mission critical data (MCData). Support for mission criticalfunctions may include prioritization of services, and mission criticalservices may be used for public safety or general commercialapplications. The terms ultra-reliable, low-latency, mission critical,and ultra-reliable low-latency may be used interchangeably herein.

In some examples, a UE 115 may also be able to communicate directly withother UEs 115 over a device-to-device (D2D) communication link 135(e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115utilizing D2D communications may be within the geographic coverage area110 of a base station 105. Other UEs 115 in such a group may be outsidethe geographic coverage area 110 of a base station 105 or be otherwiseunable to receive transmissions from a base station 105. In someexamples, groups of the UEs 115 communicating via D2D communications mayutilize a one-to-many (1:M) system in which each UE 115 transmits toevery other UE 115 in the group. In some examples, a base station 105facilitates the scheduling of resources for D2D communications. In othercases, D2D communications are carried out between the UEs 115 withoutthe involvement of a base station 105.

In some systems, the D2D communication link 135 may be an example of acommunication channel, such as a sidelink communication channel, betweenvehicles (e.g., UEs 115). In some examples, vehicles may communicateusing vehicle-to-everything (V2X) communications, vehicle-to-vehicle(V2V) communications, or some combination of these. A vehicle may signalinformation related to traffic conditions, signal scheduling, weather,safety, emergencies, or any other information relevant to a V2X system.In some examples, vehicles in a V2X system may communicate with roadsideinfrastructure, such as roadside units, or with the network via one ormore network nodes (e.g., base stations 105) using vehicle-to-network(V2N) communications, or with both.

The core network 130 may provide user authentication, accessauthorization, tracking, Internet Protocol (IP) connectivity, and otheraccess, routing, or mobility functions. The core network 130 may be anevolved packet core (EPC) or 5G core (5GC), which may include at leastone control plane entity that manages access and mobility (e.g., amobility management entity (MME), an access and mobility managementfunction (AMF)) and at least one user plane entity that routes packetsor interconnects to external networks (e.g., a serving gateway (S-GW), aPacket Data Network (PDN) gateway (P-GW), or a user plane function(UPF)). The control plane entity may manage non-access stratum (NAS)functions such as mobility, authentication, and bearer management forthe UEs 115 served by the base stations 105 associated with the corenetwork 130. User IP packets may be transferred through the user planeentity, which may provide IP address allocation as well as otherfunctions. The user plane entity may be connected to the networkoperators IP services 150. The operators IP services 150 may includeaccess to the Internet, Intranet(s), an IP Multimedia Subsystem (IMS),or a Packet-Switched Streaming Service.

Some of the network devices, such as a base station 105, may includesubcomponents such as an access network entity 140, which may be anexample of an access node controller (ANC). Each access network entity140 may communicate with the UEs 115 through one or more other accessnetwork transmission entities 145, which may be referred to as radioheads, smart radio heads, or transmission/reception points (TRPs). Eachaccess network transmission entity 145 may include one or more antennapanels. In some configurations, various functions of each access networkentity 140 or base station 105 may be distributed across various networkdevices (e.g., radio heads and ANCs) or consolidated into a singlenetwork device (e.g., a base station 105).

The wireless communications system 100 may operate using one or morefrequency bands, typically in the range of 300 MHz to 300 gigahertz(GHz). Generally, the region from 300 MHz to 3 GHz is known as theultra-high frequency (UHF) region or decimeter band because thewavelengths range from approximately one decimeter to one meter inlength. The UHF waves may be blocked or redirected by buildings andenvironmental features, but the waves may penetrate structuressufficiently for a macro cell to provide service to the UEs 115 locatedindoors. The transmission of UHF waves may be associated with smallerantennas and shorter ranges (e.g., less than 100 kilometers) compared totransmission using the smaller frequencies and longer waves of the highfrequency (HF) or very high frequency (VHF) portion of the spectrumbelow 300 MHz.

The wireless communications system 100 may also operate in a super highfrequency (SHF) region using frequency bands from 3 GHz to 30 GHz, alsoknown as the centimeter band, or in an extremely high frequency (EHF)region of the spectrum (e.g., from 30 GHz to 300 GHz), also known as themillimeter band. In some examples, the wireless communications system100 may support millimeter wave (mmW) communications between the UEs 115and the base stations 105, and EHF antennas of the respective devicesmay be smaller and more closely spaced than UHF antennas. In someexamples, this may facilitate use of antenna arrays within a device. Thepropagation of EHF transmissions, however, may be subject to evengreater atmospheric attenuation and shorter range than SHF or UHFtransmissions. The techniques disclosed herein may be employed acrosstransmissions that use one or more different frequency regions, anddesignated use of bands across these frequency regions may differ bycountry or regulating body.

The wireless communications system 100 may utilize both licensed andunlicensed radio frequency spectrum bands. For example, the wirelesscommunications system 100 may employ License Assisted Access (LAA),LTE-Unlicensed (LTE-U) radio access technology, or NR technology in anunlicensed band such as the 5 GHz industrial, scientific, and medical(ISM) band. When operating in unlicensed radio frequency spectrum bands,devices such as the base stations 105 and the UEs 115 may employ carriersensing for collision detection and avoidance. In some examples,operations in unlicensed bands may be based on a carrier aggregationconfiguration in conjunction with component carriers operating in alicensed band (e.g., LAA). Operations in unlicensed spectrum may includedownlink transmissions, uplink transmissions, P2P transmissions, or D2Dtransmissions, among other examples.

A base station 105 or a UE 115 may be equipped with multiple antennas,which may be used to employ techniques such as transmit diversity,receive diversity, multiple-input multiple-output (MIMO) communications,or beamforming. The antennas of a base station 105 or a UE 115 may belocated within one or more antenna arrays or antenna panels, which maysupport MIMO operations or transmit or receive beamforming. For example,one or more base station antennas or antenna arrays may be co-located atan antenna assembly, such as an antenna tower. In some examples,antennas or antenna arrays associated with a base station 105 may belocated in diverse geographic locations. A base station 105 may have anantenna array with a number of rows and columns of antenna ports thatthe base station 105 may use to support beamforming of communicationswith a UE 115. Likewise, a UE 115 may have one or more antenna arraysthat may support various MIMO or beamforming operations. Additionally,or alternatively, an antenna panel may support radio frequencybeamforming for a signal transmitted via an antenna port.

The base stations 105 or the UEs 115 may use MIMO communications toexploit multipath signal propagation and increase the spectralefficiency by transmitting or receiving multiple signals via differentspatial layers. Such techniques may be referred to as spatialmultiplexing. The multiple signals may, for example, be transmitted bythe transmitting device via different antennas or different combinationsof antennas. Likewise, the multiple signals may be received by thereceiving device via different antennas or different combinations ofantennas. Each of the multiple signals may be referred to as a separatespatial stream and may carry bits associated with the same data stream(e.g., the same codeword) or different data streams (e.g., differentcodewords). Different spatial layers may be associated with differentantenna ports used for channel measurement and reporting. MIMOtechniques include single-user MIMO (SU-MIMO), where multiple spatiallayers are transmitted to the same receiving device, and multiple-userMIMO (MU-MIMO), where multiple spatial layers are transmitted tomultiple devices.

Beamforming, which may also be referred to as spatial filtering,directional transmission, or directional reception, is a signalprocessing technique that may be used at a transmitting device or areceiving device (e.g., a base station 105, a UE 115) to shape or steeran antenna beam (e.g., a transmit beam, a receive beam) along a spatialpath between the transmitting device and the receiving device.Beamforming may be achieved by combining the signals communicated viaantenna elements of an antenna array such that some signals propagatingat particular orientations with respect to an antenna array experienceconstructive interference while others experience destructiveinterference. The adjustment of signals communicated via the antennaelements may include a transmitting device or a receiving deviceapplying amplitude offsets, phase offsets, or both to signals carriedvia the antenna elements associated with the device. The adjustmentsassociated with each of the antenna elements may be defined by abeamforming weight set associated with a particular orientation (e.g.,with respect to the antenna array of the transmitting device orreceiving device, or with respect to some other orientation).

A base station 105 or a UE 115 may use beam sweeping techniques as partof beam forming operations. For example, a base station 105 may usemultiple antennas or antenna arrays (e.g., antenna panels) to conductbeamforming operations for directional communications with a UE 115.Some signals (e.g., synchronization signals, reference signals, beamselection signals, or other control signals) may be transmitted by abase station 105 multiple times in different directions. For example,the base station 105 may transmit a signal according to differentbeamforming weight sets associated with different directions oftransmission. Transmissions in different beam directions may be used toidentify (e.g., by a transmitting device, such as a base station 105, orby a receiving device, such as a UE 115) a beam direction for latertransmission or reception by the base station 105.

Some signals, such as data signals associated with a particularreceiving device, may be transmitted by a base station 105 in a singlebeam direction (e.g., a direction associated with the receiving device,such as a UE 115). In some examples, the beam direction associated withtransmissions along a single beam direction may be determined based on asignal that was transmitted in one or more beam directions. For example,a UE 115 may receive one or more of the signals transmitted by the basestation 105 in different directions and may report to the base station105 an indication of the signal that the UE 115 received with a highestsignal quality or an otherwise acceptable signal quality.

In some examples, transmissions by a device (e.g., by a base station 105or a UE 115) may be performed using multiple beam directions, and thedevice may use a combination of digital precoding or radio frequencybeamforming to generate a combined beam for transmission (e.g., from abase station 105 to a UE 115). The UE 115 may report feedback thatindicates precoding weights for one or more beam directions, and thefeedback may correspond to a configured number of beams across a systembandwidth or one or more sub-bands. The base station 105 may transmit areference signal (e.g., a cell-specific reference signal (CRS), achannel state information reference signal (CSI-RS)), which may beprecoded or unprecoded. The UE 115 may provide feedback for beamselection, which may be a precoding matrix indicator (PMI) orcodebook-based feedback (e.g., a multi-panel type codebook, a linearcombination type codebook, a port selection type codebook). Althoughthese techniques are described with reference to signals transmitted inone or more directions by a base station 105, a UE 115 may employsimilar techniques for transmitting signals multiple times in differentdirections (e.g., for identifying a beam direction for subsequenttransmission or reception by the UE 115) or for transmitting a signal ina single direction (e.g., for transmitting data to a receiving device).

A receiving device (e.g., a UE 115) may try multiple receiveconfigurations (e.g., directional listening) when receiving varioussignals from the base station 105, such as synchronization signals,reference signals, beam selection signals, or other control signals. Forexample, a receiving device may try multiple receive directions byreceiving via different antenna subarrays, by processing receivedsignals according to different antenna subarrays, by receiving accordingto different receive beamforming weight sets (e.g., differentdirectional listening weight sets) applied to signals received atmultiple antenna elements of an antenna array, or by processing receivedsignals according to different receive beamforming weight sets appliedto signals received at multiple antenna elements of an antenna array,any of which may be referred to as “listening” according to differentreceive configurations or receive directions. In some examples, areceiving device may use a single receive configuration to receive alonga single beam direction (e.g., when receiving a data signal). The singlereceive configuration may be aligned in a beam direction determinedbased on listening according to different receive configurationdirections (e.g., a beam direction determined to have a highest signalstrength, highest signal-to-noise ratio (SNR), or otherwise acceptablesignal quality based on listening according to multiple beamdirections).

The wireless communications system 100 may be a packet-based networkthat operates according to a layered protocol stack. In the user plane,communications at the bearer or Packet Data Convergence Protocol (PDCP)layer may be IP-based. A Radio Link Control (RLC) layer may performpacket segmentation and reassembly to communicate over logical channels.A Medium Access Control (MAC) layer may perform priority handling andmultiplexing of logical channels into transport channels. The MAC layermay also use error detection techniques, error correction techniques, orboth to support retransmissions at the MAC layer to improve linkefficiency. In the control plane, the RRC protocol layer may provideestablishment, configuration, and maintenance of an RRC connectionbetween a UE 115 and a base station 105 or a core network 130 supportingradio bearers for user plane data. At the physical layer, transportchannels may be mapped to physical channels.

The UEs 115 and the base stations 105 may support retransmissions ofdata to increase the likelihood that data is received successfully.Hybrid automatic repeat request (HARQ) feedback is one technique forincreasing the likelihood that data is received correctly over acommunication link 125. HARQ may include a combination of errordetection (e.g., using a cyclic redundancy check (CRC)), forward errorcorrection (FEC), and retransmission (e.g., automatic repeat request(ARQ)). HARQ may improve throughput at the MAC layer in poor radioconditions (e.g., low signal-to-noise conditions). In some examples, adevice may support same-slot HARQ feedback, where the device may provideHARQ feedback in a specific slot for data received in a previous symbolin the slot. In other cases, the device may provide HARQ feedback in asubsequent slot, or according to some other time interval.

A UE 115 may initiate a random access procedure (e.g., a two-step randomaccess procedure, a four step random access procedure, or another randomaccess procedure) with a base station 105 in order to communicate withbase station 105. The random access procedure may be initiated throughtransmission of an initial message (e.g., MsgA or Msg1 of a two-steprandom access procedure) over resources allocated for random accessprocedures (e.g., RACH resources), which may not be scheduled orallocated for use by a given UE 115, but instead may be available to allUEs 115 in the wireless communications system 100 wishing to connectwith and communication with a base station 105. For example, the UE 115may initiate the procedure my transmitting a random access message alongwith an associated preamble to the base station 105.

The transmission of the random access message may depend on theconnected-state (e.g., RRC state) of the UE 115. For instance, one ormore transmission parameters such as transport block size (TBS), MCS,demodulation reference signal (DMRS) resource information, waveformtype, among other parameters, may be indicated to the UE 115 through aconfiguration (e.g., a message indicating a configuration for the firstmessage of the two-step random access procedure) from the base station105, and may vary depending on the connected-state of the UE 115. Insome cases, a UE 115 operating in a given RRC state may transmit arandom access message with a different payload size or using differentresources than the same UE 115 (or another UE 115) operating in adifferent RRC state. In order to improve resource utilization, a basestation 105 may periodically transmit configuration information to oneor more UEs 115, which the UEs 115 may use to determine or modifytransmission of the initial message of the two-step random accessprocedure (e.g., based on the RRC state).

FIG. 2 illustrates an example of a wireless communications system 200that supports message configuration for two-step random access procedurein accordance with aspects of the present disclosure. In some examples,wireless communications system 200 may implement aspects of wirelesscommunications system 100. For example, wireless communications system200 may include UE 115-a, which may be an example of a UE 115 asdescribed with respect to FIG. 1 . Wireless communications system 200may also include base station 105-a, which may be an example of a basestation 105 as described with respect to FIG. 1 . Base station 105-a mayserve a coverage area 110-a (e.g., base station 105 may supportcommunication with one or more devices over coverage area 110-a), andmay communicate with a UE 115-a served by base station 105-a usingcommunication links 125 (e.g., communication links 125-a and 125-b).

UE 115-a may communicate with base station 105-a using a two-step RACHprocess to initiate communications without prior scheduling informationfrom base station 105-a. A two-step RACH process may include thetransmission, by UE 115-a, of a first random access message 215 (e.g.,RACH MsgA), which may include a preamble, followed by transmission, bythe base station 105-a, of a random access response message 220 inresponse to the first random access message 215.

During a random access procedure such as a two-step random accessprocedure, the traffic pattern and payload size of the first randomaccess message 215 sent by UE 115-a may vary. This variance may be dueto different types of connection (e.g., connected-state such as the RRCstate of the UE 115-a, which may change based on RRC signalingtransmitted from the base station 105-a to the UE 115-a), registration,and session management processes and procedures by the core network. Toreduce inefficiencies caused by the varying traffic pattern and payloadsize of the first random access message 215 transmitted by UE 115-a,base station 105-a may periodically transmit configuration information210 to UE 115-a. The configuration information 210 may include one ormore parameters for the first random access message 215 of the two-steprandom access procedure. Configuration information 210 may betransmitted by base station 105-a in SSB configuration information,which may be included in a SIB periodically broadcasted by base station105-a. In other cases, base station 105-a may transmit configurationinformation 210 in a unicast transmission to UE 115-a, or in a pagingtransmission. UE 115-a may receive configuration information 210 beforetransmitting first random access message 215.

Configuration information 210 may indicate a set of transmissionparameters for the first message of the two-step random access procedurevia a set of IEs in the configuration information 210. One IE may be anRRC state IE, which may indicate one or more of an RRC idle field, anRRC inactive field, and an RRC connected field and specifies the RRCstate to which the configuration information corresponds.

Another IE in configuration information 210 may be a preamble resourceconfiguration IE for the first message of the two-step random accessprocedure. This IE may include configurable fields that indicateresources for a preamble of the first message and may include a preamblesequence index field, a preamble occasion (RO) or RACH occasion (RO)index field, a physical random access channel (PRACH) slot index field,and an RO sharing status between two-step and four step RACH field(s).

Another IE in configuration information 210 may be a PUSCH resource unit(PRU) configuration IE. This field may include configurable fields fordemodulation reference signal (DMRS) resource configuration informationsuch as a number of DMRS symbols field, a DMRS type field, a DMRS portindex field, DMRS sequence indices field, a flag for transform precodingfield, a flag for DMRS sequence hopping, and other fields. The PRUconfiguration may also include or indicate a PUSCH occasion (PO)configuration. The PO configuration may include a number of fields suchas a TBS, MCS field, time resource size and frequency resource size, aguard band field, a guard period first, a enabled/disabled TBSrepetition field, a PUSCH mapping type of PO groups field, afrequency-domain starting point of PO groups with respect to the firstphysical resource block (PRB) of the active uplink BWP, a time-domainstarting point of PO groups with respect to the boundary of theassociated PRACH slot, and other fields.

Configuration information 210 may also include a preamble to PRU mappingtype IE. This may include a set of configurable fields including 1 to 1,1 to M1 (i.e., one to many, where M1 is an integer greater than 1), M2to 1 (i.e., many to one, where M2 is an integer that is great than 1 andmay be the same or different than M1). The configuration information forthe first RACH message may also include an SSB to RO or PO associationpattern IE.

In some cases, the configuration information 210 for different RRCstates may be scrambled by different radio network temporary identifiers(RNTIs) such that configuration information 210 for a first RRC state isscrambled with a different RNTI than the configuration information 210for a second RRC state. In other examples, a group RNTI may be used toscramble configuration information 210 for a set of RRC states, and adifferent RNTI or group RNTI may be used to scramble configurationinformation for a different set of RRC states. Additionally oralternatively, configuration information 210 for different RRC statesmay be transmitted using different downlink signaling (e.g., a firstsignal may be used to indicate configuration information 210 for a firstRRC state and a second different signal may be used to indicateconfiguration information 210 for a second RRC state).

According to some aspects, UE 115-a may be configured for a two-steprandom access procedure in which configuration information 210 for RRCidle and RRC inactive states may be grouped into one macro state (e.g.,RRC NON-CONNECTED state). Configuration information 210 for this macrostate (RRC NON-CONNECTED) may share the same first random access messageconfiguration and may be scrambled by the same group RNTI. That is, theconfiguration information 210 for RRC idle and RRC inactive states maybe the same and, in some cases, may be indicated to the UE 115-a in asingle message. In such cases, the first random access messageconfiguration information for a connected-state (e.g., RRC CONNECTED)may be scrambled with a different RNTI or transmitted using differentdownlink signaling as compared to the configuration information for theRRC NON-CONNECTED state.

In other cases, UE 115-a may be configured for a two-step random accessprocedure in which configuration information 210 for RRC inactive andRRC connected states may be grouped into one macro state (e.g.,Registration Management (RM) registered). Configuration information 210for this macro state (RM Registered) may share the same first randomaccess message configuration and may be scrambled by the same groupRNTI. That is, the configuration information 210 for RRC inactive andRRC connected states may be the same and in some cases may be indicatedto the UE 115-a in a single message. In such cases, the first randomaccess message configuration information for RRC idle state (e.g., RRCIDLE) may be scrambled with a different RNTI or transmitted usingdifferent downlink signaling as compared to the configurationinformation for the RM Registered state.

In other cases, the downlink signaling mechanism used for transmittingthe configuration information may not impact (e.g., may not be used toindicate or determine) the configuration for the first random accessmessage of a two-step random access procedure. Additionally, oralternatively, the RRC signaling may be scheduled or waived for an RRCconnected UE 115.

Configuration information 210 may also include an indication of time,frequency, or code resources for one or more UEs 115 (e.g., UE 115-a)that may be used for transmission of the first random access message. Insome cases, the configuration information for RRC connected state andone of an RRC idle or inactive state may share configurationconfigurations, as indicated in configuration information 210. In thesecases, a first random access message 215 from a UE 115-a in one RRCstate may share or partially share time, frequency, or code resourceswith UEs 115 in other RRC states or the same UE 115-a in a different RRCstate. Such configurations may occur in cases where there is no resourceorthogonalization in time, frequency, or code domains, among otherscenarios.

According to some aspects, the resource pools for a preamble of thefirst random access message 215, DMRS, and PUSCH configurations mayoverlap among different RRC states. In other cases, a UE 115-a in an RRCconnected state may fail to decode the RRC signaling (e.g.,configuration information 210 received in RRC signaling, or RRCsignaling indicating the RRC state of the UE 115-a) and may fall back toa previous configuration for the first random access message 215, whichmay be indicated by SI. In any case, a UE 115-a in an RRC connectedstate may use configuration information 210 for the first random accessmessage 215 signaled in different types of downlink signaling such asconfiguration information 210 signaled in both RRC signaling and SI,which may include or overlap configuration information 210 for the firstrandom access message 215 for the RRC idle state or and the RRC inactivestate.

In other cases, first random access preamble transmissions correspondingto different RRC states may be orthogonalized in time, frequency, orcode domain resources. In such case, a UE 115-a in an RRC connectedstate may be configured through dedicated RRC signaling with separatepreamble sequence sets, or a set of RO, DMRS port, or PO resources thatare orthogonal to other UEs 115 supported by the base station 105-a(e.g., UEs 115 in a non-connected RRC state (e.g., idle or inactive)).In this case, UEs 115 in a non-connected RRC state may not fall back tothe first random access preamble configuration indicated by the SI.

In another case, the first random access preamble configuration may bedependent on the RRC state. In this case, a UE 115-a may only apply therandom access message configuration information scrambled by acorresponding RNTI. In this example, time, frequency, or code domainresources may be allocated to different group RNTI that may beorthogonalized.

Based on receiving configuration information 210 over communication link125-a, UE 115-a may perform downlink synchronization, SI decoding, andmeasurement of frequencies and SSBs of base station 105-a. Afterperforming one or more of these processes, UE 115-a may initiate atwo-step random access procedure. UE 115-a may use the configurationinformation 210 received from base station 105-a to determine theconfiguration of the preamble for the first random access message 215,including traffic pattern, payload size, and other information based onthe RRC state of UE 115-a. UE 115-a may transmit first random accessmessage 215 to base station 105-a over communication link 125-b. Firstrandom access message 215 may include a random access preamble and arandom access payload. In other cases, the random access payload may betransmitted by UE 115-a in a different message after the transmission ofthe random access preamble.

Based on the transmission of the first random access message 215, basestation 105-a may transmit a random access response message 220 (e.g.,MsgB) as part of the two-step random access procedure. The random accessresponse message 220 may be a random access response message including aphysical downlink control channel (PDCCH), a random access responsephysical downlink shared channel (PDSCH), or a combination thereof. Thetransmission of the random access response message 220 by base station105-a may occur over communication link 125-a, and may indicate thecompletion of the two-step random access procedure.

FIG. 3 illustrates an example of a process flow 300 that supportsmessage configuration for two-step random access procedure in accordancewith aspects of the present disclosure. In some examples, process flow300 may implement aspects of wireless communications systems 100 and200. Process flow 300 may include UE 115-b and a base station 105-b,which may be examples of the corresponding devices as described withrespect to FIGS. 1 and 2 .

At 305, base station 105-b may transmit, to UE 115-b, configurationinformation for a first message of a two-step random access procedurebetween UE 115-b and base station 105-a. The configuration informationmay include a connection state elements (e.g., IEs) indicating that theconfiguration information corresponds to a connection state of UE 115-b.UE 115-b may receive the configuration information from base station105-a. UE 115-b may receive the configuration information via an SSB, aSIB, a paging message, an RRC message, or a combination of these. Theconfiguration information transmitted at 305 may be scrambled by basestation 105-b, and may be descrambled by UE 115-b based on theconfiguration information.

The configuration information received at 305 may include preambleresource information, PUSCH resource information, TBS, MCS, waveform,DMRS resource information, a mapping of a preamble to a PRU, anassociation between an SSB and RO or PO, or any combination of these.

In some cases, UE 115-b may descramble the configuration informationbased on a connection-state specific RNTI associated with the connectionstate of UE 115-b. The connection-state of UE 115-b may be one or RRCidle mode, RRC inactive mode, or RRC connected mode. UE 115-b may alsoreceive second configuration information for the first message of thetwo-step random access procedure. The second configuration informationmay include a second connection-state dependent elements indicating thatthe second configuration information corresponds to a secondconnection-state of UE 115-b, which may be different from the currentconnection-state of UE 115-b. UE 115-b may descramble the secondconfiguration information based on a second connection-state specificRNTI associated with the second connection-state of UE 115-b.

In other cases, UE 115-b may descramble the configuration informationreceived at 305 based on a group RNTI that may be associated withmultiple connection-states of UE 115-b. The multiple connection-statesof UE 115-b in this case may include an RRC idle mode and an RRCinactive mode. UE 115-b may receive second configuration information forthe first message of the two-step random access procedure. The secondconfiguration information may include a second connection-statedependent element indicating that the second configuration informationmay correspond to a second connection-state of UE 115-b, which may bedifferent from the connection-state of UE 115-b. In this case, UE 115-bmay descramble the second configuration information based on a secondgroup-specific RNTI that may be associated with the secondconnection-state of UE 115-b.

In some cases, UE 115-b may receive the configuration information forthe first signal via a first signal. UE 115-b may also receive a secondsignal different from the first signal. The second signal may includesecond configuration information for the first message of the two-steprandom access procedure. The second configuration information mayinclude a second connection-state dependent element indicating that thesecond configuration information may correspond to a secondconnection-state of UE 115-b different from the current connection-stateof UE 115-b. In some examples, the second configuration information maycorrespond to multiple connection-states of UE 115-b, each of which maybe different from the current connection-state of UE 115-b.

In some other cases, UE 115-b may receive second configurationinformation for the first message of the two-step random accessprocedure, where the second configuration information may include asecond connection-state dependent element that may indicate that thesecond configuration information may correspond to a secondconnection-state of UE 115-b that may be different from the currentconnection-state of UE 115-b. In these cases, UE 115-b may transmit, at310, the first message of the two-step random access procedure, whichmay be according to at least a portion of the second configurationinformation. Further, in these cases, the preamble resource informationof the first configuration information may at least partially overlapwith preamble resource information of the second configurationinformation, or PUSCH resource information of the first configurationinformation may at least partially overlap with PUSCH resourceinformation of the second configuration information, or DMRS resourceinformation of the first configuration information may at leastpartially overlap with DMRS resource information of the secondconfiguration information, or TBS information of the first configurationinformation may at least partially overlaps TBS information of thesecond configuration information, or MCS information of the firstconfiguration information may at least partially overlap with MCSinformation of the second configuration information, or a mappingrelation between preamble and PRU of the first configuration informationmay at least partially overlap the mapping relation between preamble andPRU of the second configuration information, or an association patternbetween SSB and preamble RO or PO of the first configuration informationmay at least partially overlap with the association pattern between SSBand preamble RO or PO of the second configuration information.

In some cases, UE 115-b may receive the second configuration informationin a signal different from the first configuration information while UE115-b is in the current connected state. UE 115-b may decode both thesecond configuration and the first configuration information, and maytransmit the first message (at 310) based on the first configurationinformation or the second configuration information.

In other cases, UE 115-b may descramble the configuration informationbased on a group specific RNTI that may be associated with multipleconnection-states of UE 115-b. The multiple connection-states mayinclude an RRC inactive mode and an RRC connected mode. In someexamples, UE 115-b may also receive second configuration information forthe first message of the two-step random access procedure, where thesecond configuration information may include a second connection-statedependent element indicating that the second configuration informationmay correspond to a second connection-state of UE 115-b that isdifferent from the current connection-state of UE 115-b. In theseexamples, UE 115-b may descramble the second configuration informationbased on a second group specific RNTI that may be associated with thesecond connection-state of UE 115-b.

In these examples, UE 115-b may also select a value for a preambleresource, PUSCH resource, TBS, MCS, waveform, DMRS resource, a preambleto a PRU mapping, an SSB to RO or PO association, from a union of thefirst and the second configuration information, from the secondconfiguration information only, or from the first configurationinformation only. UE 115-b may apply the selected value to the firstmessage of the two-step random access procedure for transmitting thefirst message to base station 105-b, which may occur at 310.

Further, UE 115-b may also receive second configuration information forthe first message of the two-step random access procedure, where thesecond configuration information includes a second connection-statedependent element indicating that the second configuration informationcorresponds to a second connection-state of UE 115-b, which may bedifferent from the current connection-state of UE 115-b. UE 115-b maythen transmit the first message of the two-step random access procedureat 310 according to at least a portion of the second configurationinformation.

At 310, UE 115-b may transmit, to base station 105-b, and based on acurrent connection-state of UE 115-b being the connection-state of UE115-b to which the configuration information corresponds, the firstmessage (e.g., a first random access message) of the two-step randomaccess procedure. UE 115-b may determine the current connection-state ofUE 115-b at one or RRC idle mode, RRC inactive mode, or RRC connectedmode

In some cases, UE 115-b may fail to decide the first configurationinformation while UE 115-b is in the current connected-state. In thesecases, UE 115-b may transmit the first message at 310 based on thesecond configuration information corresponding to the secondconnection-state of UE 115-b.

In some cases, UE 115-b may receive system information that indicatessecond configuration information for the first message of the two-steprandom access procedure, where the second configuration informationincludes a second connection-state of UE 115-b that may be differentfrom the connection-state of UE 115-b. In these cases, UE 115-b may alsoreceive RRC signaling that may include configuration information thatmay correspond to the second connection state of UE 115-b. UE 115-b maythen transmit the first message of the two-step random access procedureaccording to the configuration information, which may be independent ofthe system information.

At 315, UE 115-b may monitor for a random access response message of thetwo-step random access procedure from base station 105-b in response tothe first random access message transmitted at 310 to base station105-b.

FIG. 4 shows a block diagram 400 of a device 405 that supports messageconfiguration for two-step random access procedure in accordance withaspects of the present disclosure. The device 405 may be an example ofaspects of a UE 115 as described herein. The device 405 may include areceiver 410, a communications manager 415, and a transmitter 420. Thedevice 405 may also include a processor. Each of these components may bein communication with one another (e.g., via one or more buses).

The receiver 410 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to messageconfiguration for two-step random access procedure, etc.). Informationmay be passed on to other components of the device 405. The receiver 410may be an example of aspects of the transceiver 720 described withreference to FIG. 7 . The receiver 410 may utilize a single antenna or aset of antennas.

The communications manager 415 may receive, from a base station,configuration information for a first message of a two-step randomaccess procedure between the UE and the base station, the configurationinformation including a connection-state dependent element indicatingthat the configuration information corresponds to a connection-state ofthe UE, transmit, to the base station and based on a currentconnection-state of the UE being the connection-state of the UE to whichthe configuration information corresponds, the first message of thetwo-step random access procedure, and monitor for a second message(e.g., a random access response message) of the two-step random accessprocedure from the base station in response to the first message. Thecommunications manager 415 may be an example of aspects of thecommunications manager 710 described herein.

The communications manager 415, or its sub-components, may beimplemented in hardware, code (e.g., software or firmware) executed by aprocessor, or any combination thereof. If implemented in code executedby a processor, the functions of the communications manager 415, or itssub-components may be executed by a general-purpose processor, a digitalsignal processor (DSP), an application-specific integrated circuit(ASIC), a field-programmable gate array (FPGA) or other programmablelogic device, discrete gate or transistor logic, discrete hardwarecomponents, or any combination thereof designed to perform the functionsdescribed in the present disclosure.

The communications manager 415, or its sub-components, may be physicallylocated at various positions, including being distributed such thatportions of functions are implemented at different physical locations byone or more physical components. In some examples, the communicationsmanager 415, or its sub-components, may be a separate and distinctcomponent in accordance with various aspects of the present disclosure.In some examples, the communications manager 415, or its sub-components,may be combined with one or more other hardware components, includingbut not limited to an input/output (I/O) component, a transceiver, anetwork server, another computing device, one or more other componentsdescribed in the present disclosure, or a combination thereof inaccordance with various aspects of the present disclosure.

The transmitter 420 may transmit signals generated by other componentsof the device 405. In some examples, the transmitter 420 may becollocated with a receiver 410 in a transceiver module. For example, thetransmitter 420 may be an example of aspects of the transceiver 720described with reference to FIG. 7 . The transmitter 420 may utilize asingle antenna or a set of antennas.

In some examples, the communications manager 415 described herein may beimplemented as a chipset of a wireless modem, and the receiver 410 andthe transmitter 420 may be implemented as sets of analog components(e.g., amplifiers, filters, phase shifters, antennas, etc.) The wirelessmodem may obtain and decode signals from the receiver 410 over a receiveinterface, and may output signals for transmission to the transmitter420 over a transmit interface.

The actions performed by the communications manager 415 may beimplemented to realize one or more potential advantages. Oneimplementation may allow a UE 115 to save power and increase batterylife by improving the resource utilization of the UE 115. This may allowfor decreased signaling overhead, which may improve the efficiency ofthe UE 115. Another implementation may provide improved quality andreliability of service at the UE 115 by decreasing latency by improvingresource utilization.

FIG. 5 shows a block diagram 500 of a device 505 that supports messageconfiguration for two-step random access procedure in accordance withaspects of the present disclosure. The device 505 may be an example ofaspects of a device 405, or a UE 115 as described herein. The device 505may include a receiver 510, a communications manager 515, and atransmitter 535. The device 505 may also include a processor. Each ofthese components may be in communication with one another (e.g., via oneor more buses).

The receiver 510 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to messageconfiguration for two-step random access procedure, etc.). Informationmay be passed on to other components of the device 505. The receiver 510may be an example of aspects of the transceiver 720 described withreference to FIG. 7 . The receiver 510 may utilize a single antenna or aset of antennas.

The communications manager 515 may be an example of aspects of thecommunications manager 415 as described herein. The communicationsmanager 515 may include a configuration component 520, a random accesscomponent 525, and a random access response component 530. Thecommunications manager 515 may be an example of aspects of thecommunications manager 710 described herein.

The configuration component 520 may receive, from a base station,configuration information for a first message of a two-step randomaccess procedure between the UE and the base station, the configurationinformation including a connection-state dependent element indicatingthat the configuration information corresponds to a connection-state ofthe UE.

The random access component 525 may transmit, to the base station andbased on a current connection-state of the UE being the connection-stateof the UE to which the configuration information corresponds, the firstmessage of the two-step random access procedure.

The random access response component 530 may monitor for a secondmessage of the two-step random access procedure from the base station inresponse to the first message.

The transmitter 535 may transmit signals generated by other componentsof the device 505. In some examples, the transmitter 535 may becollocated with a receiver 510 in a transceiver module. For example, thetransmitter 535 may be an example of aspects of the transceiver 720described with reference to FIG. 7 . The transmitter 535 may utilize asingle antenna or a set of antennas.

A processor of a UE 115 may improve resource allocation of the resourcesused by the UE 115 for transmission of a first random access message ofa two-step random access procedure between the UE and a base station105. The processor may power on one or more processing units to controla receiver 510 to receive configuration information from a base station105. The processor may use the configuration information to control thetransmitter 535 to transmit a first random access message with efficientresource usage based on the RRC state information included in theconfiguration information received by receiver 510. The processor maypower on one or more processing units to control the transmission of thefirst random access message (e.g., MsgA) by transmitter 535.

FIG. 6 shows a block diagram 600 of a communications manager 605 thatsupports message configuration for two-step random access procedure inaccordance with aspects of the present disclosure. The communicationsmanager 605 may be an example of aspects of a communications manager415, a communications manager 515, or a communications manager 710described herein. The communications manager 605 may include aconfiguration component 610, a random access component 615, a randomaccess response component 620, a descrambling component 625, a valuedetermination component 630, a value application component 635, and adecoding component 640. Each of these modules may communicate, directlyor indirectly, with one another (e.g., via one or more buses).

The configuration component 610 may receive, from a base station,configuration information for a first message of a two-step randomaccess procedure between the UE and the base station, the configurationinformation including a connection-state dependent element indicatingthat the configuration information corresponds to a connection-state ofthe UE. In some examples, the configuration component 610 may receivesecond configuration information for the first message of the two-steprandom access procedure, where the second configuration informationincludes a second connection-state dependent element indicating that thesecond configuration information corresponds to a secondconnection-state of the UE different from the current connection-stateof the UE. In some cases, the configuration component 610 may receivesecond configuration information for the first message of the two-steprandom access procedure, where the second configuration informationincludes a second connection-state dependent element indicating that thesecond configuration information corresponds to a secondconnection-state of the UE different from the connection-state of theUE.

In some examples, the configuration component 610 may receive theconfiguration information for the first message via a first signal. Insome examples, the configuration component 610 may receive a secondsignal different from the first signal, the second signal includingsecond configuration information for the first message of the two-steprandom access procedure, where the second configuration informationincludes a second connection-state dependent element indicating that thesecond configuration information corresponds to a secondconnection-state of the UE different from the current connection-stateof the UE. In some aspects, configuration component 610 may receivesecond configuration information for the first message of the two-steprandom access procedure, where the second configuration informationincludes a second connection-state dependent element indicating that thesecond configuration information corresponds to a secondconnection-state of the UE different from the current connection-stateof the UE.

In some examples, the preamble resource information of the firstconfiguration information at least partially overlaps preamble resourceinformation of the second configuration information, or PUSCH resourceinformation of the first configuration information at least partiallyoverlaps PUSCH resource information of the second configurationinformation, or DMRS resource information of the first configurationinformation at least partially overlaps DMRS resource information of thesecond configuration information, or TBS information of the firstconfiguration information at least partially overlaps TBS information ofthe second configuration information, MCS information of the firstconfiguration information at least partially overlaps MCS information ofthe second configuration information, or a mapping relation betweenpreamble and PRU of the first configuration information at leastpartially overlaps the mapping relation between preamble and PRU of thesecond configuration information, or an association pattern between SSBand preamble RO or PO of the first configuration information at leastpartially overlaps the association pattern between SSB and preamble ROor PUSCH PO of the second configuration information.

In some examples, the configuration component 610 may receive the secondconfiguration information in a signal different from the firstconfiguration information while UE is in the current connected state. Insome cases, configuration component 610 may receive SI that indicatessecond configuration information for the first message of the two-steprandom access procedure, where the second configuration informationincludes a second connection-state dependent element indicating that thesecond configuration information corresponds to a secondconnection-state of the UE different from the connection-state of theUE.

In some examples, configuration component 610 may receive RRC signalingthat includes the configuration information corresponding to the secondconnection-state of the UE. In some examples, the configurationcomponent 610 may determine the current connection-state of the UE asone of an RRC idle mode, an RRC inactive mode, or an RRC connected mode.

In some examples, the configuration component 610 may receive theconfiguration information via an SSB, a SIB, a paging message, an RRCmessage, or any combination thereof. In some cases, the configurationinformation includes preamble resource information, PUSCH resourceinformation, TBS, MCS, waveform, DMRS resource information, a mapping ofa preamble to a PRU, an association between an SSB and RO or PO, or anycombination thereof. In some cases, the second configuration informationcorresponds to multiple connection-states of the UE, each of which isdifferent from the current connection-state of the UE.

The random access component 615 may transmit, to the base station andbased on a current connection-state of the UE being the connection-stateof the UE to which the configuration information corresponds, the firstmessage of the two-step random access procedure. In some examples, therandom access component 615 may transmit the first message of thetwo-step random access procedure according to at least a portion of thesecond configuration information. In some cases, the random accesscomponent 615 may transmit, by the UE in the current connected-state,the first message based on only one of the first configurationinformation or the second configuration information. In some aspects,the random access component 615 may transmit, by the UE in the currentconnected-state, the first message based on the second configurationinformation corresponding to the second connection-state of the UE. Insome instances, the random access component 615 may transmit the firstmessage of the two-step random access procedure according to theconfiguration information independent of the system information.

The random access response component 620 may monitor for a secondmessage of the two-step random access procedure from the base station inresponse to the first message.

The descrambling component 625 may descramble the configurationinformation based on a connection-state specific RNTI associated withthe connection-state of the UE, where the connection-state of the UE isone of an RRC idle mode, an RRC inactive mode, or an RRC connected mode.In some examples, the descrambling component 625 may descramble thesecond configuration information based on a second connection-statespecific RNTI associated with the second connection-state of the UE. Insome cases, the descrambling component 625 may descramble theconfiguration information based on a group specific RNTI associated withmultiple connection-states of the UE, where the multipleconnection-states include an RRC idle mode and an RRC inactive mode. Insome examples, the descrambling component 625 may descramble the secondconfiguration information based on a second group specific RNTIassociated with the second connection-state of the UE. In some examples,the descrambling component 625 may descramble the configurationinformation based on a group specific RNTI associated with multipleconnection-states of the UE, where the multiple connection-statesinclude an RRC inactive mode and an RRC connected mode. In some cases,the descrambling component 625 may descramble the second configurationinformation based on a second group specific RNTI associated with thesecond connection-state of the UE.

The value determination component 630 may select a value for a preambleresource, PUSCH resource, TBS, MCS, waveform, DMRS resource, a preambleto a PRU mapping, an SSB to RO or PO association, from a union of thefirst and the second configuration information, from the secondconfiguration information only, or from the first configurationinformation only.

The value application component 635 may apply the selected value to thefirst message of the two-step random access procedure for transmittingthe first message to the base station.

The decoding component 640 may decode both the second configurationinformation and the first configuration information. In some examples,the decoding component 640 may fail to decode the first configurationinformation while the UE is in the current connected-state.

FIG. 7 shows a diagram of a system 700 including a device 705 thatsupports message configuration for two-step random access procedure inaccordance with aspects of the present disclosure. The device 705 may bean example of or include the components of device 405, device 505, or aUE 115 as described herein. The device 705 may include components forbi-directional voice and data communications including components fortransmitting and receiving communications, including a communicationsmanager 710, an I/O controller 715, a transceiver 720, an antenna 725,memory 730, and a processor 740. These components may be in electroniccommunication via one or more buses (e.g., bus 745).

The communications manager 710 may receive, from a base station,configuration information for a first message of a two-step randomaccess procedure between the UE and the base station, the configurationinformation including a connection-state dependent element indicatingthat the configuration information corresponds to a connection-state ofthe UE, transmit, to the base station and based on a currentconnection-state of the UE being the connection-state of the UE to whichthe configuration information corresponds, the first message of thetwo-step random access procedure, and monitor for a second message ofthe two-step random access procedure from the base station in responseto the first message.

The I/O controller 715 may manage input and output signals for thedevice 705. The I/O controller 715 may also manage peripherals notintegrated into the device 705. In some cases, the I/O controller 715may represent a physical connection or port to an external peripheral.In some cases, the I/O controller 715 may utilize an operating systemsuch as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, oranother known operating system. In other cases, the I/O controller 715may represent or interact with a modem, a keyboard, a mouse, atouchscreen, or a similar device. In some cases, the I/O controller 715may be implemented as part of a processor. In some cases, a user mayinteract with the device 705 via the I/O controller 715 or via hardwarecomponents controlled by the I/O controller 715.

The transceiver 720 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 720 may represent a wireless transceiver and may communicatebi-directionally with another wireless transceiver. The transceiver 720may also include a modem to modulate the packets and provide themodulated packets to the antennas for transmission, and to demodulatepackets received from the antennas.

In some cases, the device 705 may include a single antenna 725. or thedevice 705 may have more than one antenna 725, which may be capable ofconcurrently transmitting or receiving multiple wireless transmissions.

The memory 730 may include random access memory (RAM) and read onlymemory (ROM). The memory 730 may store computer-readable,computer-executable code 735 including instructions that, when executed,cause the processor to perform various functions described herein. Insome cases, the memory 730 may contain, among other things, a basic I/Osystem (BIOS) which may control basic hardware or software operationsuch as the interaction with peripheral components or devices.

The processor 740 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, the processor 740 may be configured to operate a memoryarray using a memory controller. In other cases, a memory controller maybe integrated into the processor 740. The processor 740 may beconfigured to execute computer-readable instructions stored in a memory(e.g., the memory 730) to cause the device 705 to perform variousfunctions (e.g., functions or tasks supporting message configuration fortwo-step random access procedure).

The code 735 may include instructions to implement aspects of thepresent disclosure, including instructions to support wirelesscommunications. The code 735 may be stored in a non-transitorycomputer-readable medium such as system memory or other type of memory.In some cases, the code 735 may not be directly executable by theprocessor 740 but may cause a computer (e.g., when compiled andexecuted) to perform functions described herein.

FIG. 8 shows a block diagram 800 of a device 805 that supports messageconfiguration for two-step random access procedure in accordance withaspects of the present disclosure. The device 805 may be an example ofaspects of a base station 105 as described herein. The device 805 mayinclude a receiver 810, a communications manager 815, and a transmitter820. The device 805 may also include a processor. Each of thesecomponents may be in communication with one another (e.g., via one ormore buses).

The receiver 810 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to messageconfiguration for two-step random access procedure, etc.). Informationmay be passed on to other components of the device 805. The receiver 810may be an example of aspects of the transceiver 1120 described withreference to FIG. 11 . The receiver 810 may utilize a single antenna ora set of antennas.

The communications manager 815 may transmit, to a UE, configurationinformation for a first message of a two-step random access procedurebetween the UE and the base station, the configuration informationincluding a connection-state dependent element indicating that theconfiguration information corresponds to a connection-state of the UE,receive, from the UE and based on a current connection-state of the UEbeing the connection-state of the UE to which the configurationinformation corresponds, the first message of the two-step random accessprocedure, and transmit a second message of the two-step random accessprocedure to the UE in response to the first message. The communicationsmanager 815 may be an example of aspects of the communications manager1110 described herein.

The communications manager 815, or its sub-components, may beimplemented in hardware, code (e.g., software or firmware) executed by aprocessor, or any combination thereof. If implemented in code executedby a processor, the functions of the communications manager 815, or itssub-components may be executed by a general-purpose processor, a DSP, anASIC, an FPGA or other programmable logic device, discrete gate ortransistor logic, discrete hardware components, or any combinationthereof designed to perform the functions described in the presentdisclosure.

The communications manager 815, or its sub-components, may be physicallylocated at various positions, including being distributed such thatportions of functions are implemented at different physical locations byone or more physical components. In some examples, the communicationsmanager 815, or its sub-components, may be a separate and distinctcomponent in accordance with various aspects of the present disclosure.In some examples, the communications manager 815, or its sub-components,may be combined with one or more other hardware components, includingbut not limited to an I/O component, a transceiver, a network server,another computing device, one or more other components described in thepresent disclosure, or a combination thereof in accordance with variousaspects of the present disclosure.

The transmitter 820 may transmit signals generated by other componentsof the device 805. In some examples, the transmitter 820 may becollocated with a receiver 810 in a transceiver module. For example, thetransmitter 820 may be an example of aspects of the transceiver 1120described with reference to FIG. 11 . The transmitter 820 may utilize asingle antenna or a set of antennas.

FIG. 9 shows a block diagram 900 of a device 905 that supports messageconfiguration for two-step random access procedure in accordance withaspects of the present disclosure. The device 905 may be an example ofaspects of a device 805, or a base station 105 as described herein. Thedevice 905 may include a receiver 910, a communications manager 915, anda transmitter 935. The device 905 may also include a processor. Each ofthese components may be in communication with one another (e.g., via oneor more buses).

The receiver 910 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to messageconfiguration for two-step random access procedure, etc.). Informationmay be passed on to other components of the device 905. The receiver 910may be an example of aspects of the transceiver 1120 described withreference to FIG. 11 . The receiver 910 may utilize a single antenna ora set of antennas.

The communications manager 915 may be an example of aspects of thecommunications manager 815 as described herein. The communicationsmanager 915 may include a connection state component 920, a randomaccess module 925, and a random access response module 930. Thecommunications manager 915 may be an example of aspects of thecommunications manager 1110 described herein.

The connection state component 920 may transmit, to a UE, configurationinformation for a first message of a two-step random access procedurebetween the UE and the base station, the configuration informationincluding a connection-state dependent element indicating that theconfiguration information corresponds to a connection-state of the UE.

The random access module 925 may receive, from the UE and based on acurrent connection-state of the UE being the connection-state of the UEto which the configuration information corresponds, the first message ofthe two-step random access procedure.

The random access response module 930 may transmit a second message ofthe two-step random access procedure to the UE in response to the firstmessage.

The transmitter 935 may transmit signals generated by other componentsof the device 905. In some examples, the transmitter 935 may becollocated with a receiver 910 in a transceiver module. For example, thetransmitter 935 may be an example of aspects of the transceiver 1120described with reference to FIG. 11 . The transmitter 935 may utilize asingle antenna or a set of antennas.

FIG. 10 shows a block diagram 1000 of a communications manager 1005 thatsupports message configuration for two-step random access procedure inaccordance with aspects of the present disclosure. The communicationsmanager 1005 may be an example of aspects of a communications manager815, a communications manager 915, or a communications manager 1110described herein. The communications manager 1005 may include aconnection state component 1010, a random access module 1015, a randomaccess response module 1020, a scrambling component 1025, and a resourcedetermination component 1030. Each of these modules may communicate,directly or indirectly, with one another (e.g., via one or more buses).

The connection state component 1010 may transmit, to a UE, configurationinformation for a first message of a two-step random access procedurebetween the UE and the base station, the configuration informationincluding a connection-state dependent element indicating that theconfiguration information corresponds to a connection-state of the UE.

In some examples, the connection state component 1010 may transmit theconfiguration information for the first message via a first signal. Insome examples, the connection state component 1010 may transmit a secondsignal different from the first signal, the second signal includingsecond configuration information for the first message of the two-steprandom access procedure, where the second configuration informationincludes a second connection-state dependent element indicating that thesecond configuration information corresponds to a secondconnection-state of the UE different from the connection-state of theUE. In some cases, the connection state component 1010 may transmit theconfiguration information via an SSB, a SIB, a paging message, an RRCmessage, or any combination thereof.

In some instances, the second configuration information corresponds tomultiple connection-states of the UE, and the second configurationinformation is different from the first configuration information forTBS, MCS, DMRS resource, preamble resource, PUSCH resource, preamble toPRU mapping, SSB to preamble RO or PO association, or any combinationthereof. In some aspects, the current connection-state of the UE as oneof an RRC idle mode, an RRC inactive mode, or an RRC connected mode. Insome cases, the configuration information includes preamble resourceinformation, PUSCH resource information, TBS, MCS, waveform, DMRSresource information, a mapping of a preamble to a PRU, an associationbetween an SSB and RO or PO, or any combination thereof.

The random access module 1015 may receive, from the UE and based on acurrent connection-state of the UE being the connection-state of the UEto which the configuration information corresponds, the first message ofthe two-step random access procedure.

The random access response module 1020 may transmit a second message ofthe two-step random access procedure to the UE in response to the firstmessage.

The scrambling component 1025 may scramble the configuration informationbased on a connection-state specific RNTI, where the connection-statespecific RNTI is associated with one of an RRC idle mode, an RRCinactive mode, or an RRC connected mode. In some examples, thescrambling component 1025 may scramble second configuration informationfor the first message of the two-step random access procedure based on asecond connection-state specific RNTI different from theconnection-state specific RNTI, where the second configurationinformation includes a second connection-state dependent elementindicating that the second configuration information corresponds to asecond connection-state of the UE different from the connection-state ofthe UE. In some examples, the scrambling component 1025 may scramble theconfiguration information based on a group specific RNTI, where thegroup specific RNTI is associated with both an RRC idle mode and an RRCinactive mode. In some cases, the scrambling component 1025 may scramblethe configuration information based on a group specific RNTI, where thegroup specific RNTI is associated with both an RRC inactive mode and anRRC connected mode.

The resource determination component 1030 may determine preambleresources for the first configuration information or secondconfiguration information. In some cases, a preamble resource of thefirst configuration information overlaps a preamble resource of a secondconfiguration information, where the second configuration informationincludes a second connection-state dependent element indicating that thesecond configuration information corresponds to a secondconnection-state of the UE different from the current connection-stateof the UE.

In some cases, one or multiple values of the first configurationinformation overlaps with one or multiple values of a secondconfiguration information for TBS, MCS, DMRS resource, preambleresource, PUSCH resource, preamble to PRU mapping, SSB to RO or POassociation, or any combination thereof, and where the secondconfiguration information includes a second connection-state dependentelement indicating that the second configuration information correspondsto a second connection-state of the UE different from the currentconnection-state of the UE.

FIG. 11 shows a diagram of a system 1100 including a device 1105 thatsupports message configuration for two-step random access procedure inaccordance with aspects of the present disclosure. The device 1105 maybe an example of or include the components of device 805, device 905, ora base station 105 as described herein. The device 1105 may includecomponents for bi-directional voice and data communications includingcomponents for transmitting and receiving communications, including acommunications manager 1110, a network communications manager 1115, atransceiver 1120, an antenna 1125, memory 1130, a processor 1140, and aninter-station communications manager 1145. These components may be inelectronic communication via one or more buses (e.g., bus 1150).

The communications manager 1110 may transmit, to a UE, configurationinformation for a first message of a two-step random access procedurebetween the UE and the base station, the configuration informationincluding a connection-state dependent element indicating that theconfiguration information corresponds to a connection-state of the UE,receive, from the UE and based on a current connection-state of the UEbeing the connection-state of the UE to which the configurationinformation corresponds, the first message of the two-step random accessprocedure, and transmit a second message of the two-step random accessprocedure to the UE in response to the first message.

The network communications manager 1115 may manage communications withthe core network (e.g., via one or more wired backhaul links). Forexample, the network communications manager 1115 may manage the transferof data communications for client devices, such as one or more UEs 115.

The transceiver 1120 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1120 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1120 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1125.However, in some cases the device may have more than one antenna 1125,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

The memory 1130 may include RAM, ROM, or a combination thereof. Thememory 1130 may store computer-readable code 1135 including instructionsthat, when executed by a processor (e.g., the processor 1140) cause thedevice to perform various functions described herein. In some cases, thememory 1130 may contain, among other things, a BIOS which may controlbasic hardware or software operation such as the interaction withperipheral components or devices.

The processor 1140 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, the processor 1140 may be configured to operate a memoryarray using a memory controller. In some cases, a memory controller maybe integrated into processor 1140. The processor 1140 may be configuredto execute computer-readable instructions stored in a memory (e.g., thememory 1130) to cause the device 1105 to perform various functions(e.g., functions or tasks supporting message configuration for two-steprandom access procedure).

The inter-station communications manager 1145 may manage communicationswith other base station 105, and may include a controller or schedulerfor controlling communications with UEs 115 in cooperation with otherbase stations 105. For example, the inter-station communications manager1145 may coordinate scheduling for transmissions to UEs 115 for variousinterference mitigation techniques such as beamforming or jointtransmission. In some examples, the inter-station communications manager1145 may provide an X2 interface within an LTE/LTE-A wirelesscommunication network technology to provide communication between basestations 105.

The code 1135 may include instructions to implement aspects of thepresent disclosure, including instructions to support wirelesscommunications. The code 1135 may be stored in a non-transitorycomputer-readable medium such as system memory or other type of memory.In some cases, the code 1135 may not be directly executable by theprocessor 1140 but may cause a computer (e.g., when compiled andexecuted) to perform functions described herein.

FIG. 12 shows a flowchart illustrating a method 1200 that supportsmessage configuration for two-step random access procedure in accordancewith aspects of the present disclosure. The operations of method 1200may be implemented by a UE 115 or its components as described herein.For example, the operations of method 1200 may be performed by acommunications manager as described with reference to FIGS. 4 through 7. In some examples, a UE may execute a set of instructions to controlthe functional elements of the UE to perform the functions describedbelow. Additionally, or alternatively, a UE may perform aspects of thefunctions described below using special-purpose hardware.

At 1205, the UE may receive, from a base station, configurationinformation for a first message of a two-step random access procedurebetween the UE and the base station, the configuration informationincluding a connection-state dependent element indicating that theconfiguration information corresponds to a connection-state of the UE.The operations of 1205 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1205may be performed by a configuration component as described withreference to FIGS. 4 through 7 .

At 1210, the UE may transmit, to the base station and based on a currentconnection-state of the UE being the connection-state of the UE to whichthe configuration information corresponds, the first message of thetwo-step random access procedure. The operations of 1210 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1210 may be performed by a random accesscomponent as described with reference to FIGS. 4 through 7 .

At 1215, the UE may monitor for a second message of the two-step randomaccess procedure from the base station in response to the first message.The operations of 1215 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1215may be performed by a random access response component as described withreference to FIGS. 4 through 7 .

FIG. 13 shows a flowchart illustrating a method 1300 that supportsmessage configuration for two-step random access procedure in accordancewith aspects of the present disclosure. The operations of method 1300may be implemented by a UE 115 or its components as described herein.For example, the operations of method 1300 may be performed by acommunications manager as described with reference to FIGS. 4 through 7. In some examples, a UE may execute a set of instructions to controlthe functional elements of the UE to perform the functions describedbelow. Additionally, or alternatively, a UE may perform aspects of thefunctions described below using special-purpose hardware.

At 1305, the UE may receive, from a base station, configurationinformation for a first message of a two-step random access procedurebetween the UE and the base station, the configuration informationincluding a connection-state dependent element indicating that theconfiguration information corresponds to a connection-state of the UE.The operations of 1305 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1305may be performed by a configuration component as described withreference to FIGS. 4 through 7 .

At 1310, the UE may descramble the configuration information based on aconnection-state specific RNTI associated with the connection-state ofthe UE, where the connection-state of the UE is one of an RRC idle mode,an RRC inactive mode, or an RRC connected mode. The operations of 1310may be performed according to the methods described herein. In someexamples, aspects of the operations of 1310 may be performed by adescrambling component as described with reference to FIGS. 4 through 7.

At 1315, the UE may transmit, to the base station and based on a currentconnection-state of the UE being the connection-state of the UE to whichthe configuration information corresponds, the first message of thetwo-step random access procedure. The operations of 1315 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1315 may be performed by a random accesscomponent as described with reference to FIGS. 4 through 7 .

At 1320, the UE may monitor for a second message of the two-step randomaccess procedure from the base station in response to the first message.The operations of 1320 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1320may be performed by a random access response component as described withreference to FIGS. 4 through 7 .

FIG. 14 shows a flowchart illustrating a method 1400 that supportsmessage configuration for two-step random access procedure in accordancewith aspects of the present disclosure. The operations of method 1400may be implemented by a UE 115 or its components as described herein.For example, the operations of method 1400 may be performed by acommunications manager as described with reference to FIGS. 4 through 7. In some examples, a UE may execute a set of instructions to controlthe functional elements of the UE to perform the functions describedbelow. Additionally, or alternatively, a UE may perform aspects of thefunctions described below using special-purpose hardware.

At 1405, the UE may receive, from a base station, configurationinformation for a first message of a two-step random access procedurebetween the UE and the base station, the configuration informationincluding a connection-state dependent element indicating that theconfiguration information corresponds to a connection-state of the UE.The operations of 1405 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1405may be performed by a configuration component as described withreference to FIGS. 4 through 7 .

At 1410, the UE may descramble the configuration information based on agroup specific RNTI associated with multiple connection-states of theUE, where the multiple connection-states include an RRC idle mode and anRRC inactive mode. The operations of 1410 may be performed according tothe methods described herein. In some examples, aspects of theoperations of 1410 may be performed by a descrambling component asdescribed with reference to FIGS. 4 through 7 .

At 1415, the UE may transmit, to the base station and based on a currentconnection-state of the UE being the connection-state of the UE to whichthe configuration information corresponds, the first message of thetwo-step random access procedure. The operations of 1415 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1415 may be performed by a random accesscomponent as described with reference to FIGS. 4 through 7 .

At 1420, the UE may monitor for a second message of the two-step randomaccess procedure from the base station in response to the first message.The operations of 1420 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1420may be performed by a random access response component as described withreference to FIGS. 4 through 7 .

FIG. 15 shows a flowchart illustrating a method 1500 that supportsmessage configuration for two-step random access procedure in accordancewith aspects of the present disclosure. The operations of method 1500may be implemented by a base station 105 or its components as describedherein. For example, the operations of method 1500 may be performed by acommunications manager as described with reference to FIGS. 8 through 11. In some examples, a base station may execute a set of instructions tocontrol the functional elements of the base station to perform thefunctions described below. Additionally, or alternatively, a basestation may perform aspects of the functions described below usingspecial-purpose hardware.

At 1505, the base station may transmit, to a UE, configurationinformation for a first message of a two-step random access procedurebetween the UE and the base station, the configuration informationincluding a connection-state dependent element indicating that theconfiguration information corresponds to a connection-state of the UE.The operations of 1505 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1505may be performed by a connection state component as described withreference to FIGS. 8 through 11 .

At 1510, the base station may receive, from the UE and based on acurrent connection-state of the UE being the connection-state of the UEto which the configuration information corresponds, the first message ofthe two-step random access procedure. The operations of 1510 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1510 may be performed by a random accessmodule as described with reference to FIGS. 8 through 11 .

At 1515, the base station may transmit a second message of the two-steprandom access procedure to the UE in response to the first message. Theoperations of 1515 may be performed according to the methods describedherein. In some examples, aspects of the operations of 1515 may beperformed by a random access response module as described with referenceto FIGS. 8 through 11 .

It should be noted that the methods described herein describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Further, aspects from two or more of the methods may be combined.

Aspects of the following examples may be combined with any of theprevious examples or aspects described herein.

Example 1: A method for wireless communications at a user equipment(UE), comprising: receiving, from a base station, configurationinformation for a first message of a two-step random access procedurebetween the UE and the base station, the configuration informationcomprising a connection-state element indicating that the configurationinformation corresponds to a connection-state of the UE; transmitting,to the base station and based at least in part on a currentconnection-state of the UE being the connection-state of the UE to whichthe configuration information corresponds, the first message of thetwo-step random access procedure; and monitoring for a second message ofthe two-step random access procedure from the base station in responseto the first message.

Example 2: The method of example 1, wherein receiving the configurationinformation comprises: descrambling the configuration information basedat least in part on a connection-state specific radio network temporaryidentifier (RNTI) associated with the connection-state of the UE,wherein the connection-state of the UE is one of a radio resourcecontrol (RRC) idle mode, an RRC inactive mode, or an RRC connected mode.

Example 3: The method of example 2, further comprising: receiving secondconfiguration information for the first message of the two-step randomaccess procedure, wherein the second configuration information comprisesa second connection-state element indicating that the secondconfiguration information corresponds to a second connection-state ofthe UE different from the current connection-state of the UE; anddescrambling the second configuration information based at least in parton a second connection-state specific RNTI associated with the secondconnection-state of the UE.

Example 4: The method of any of examples 1 to 3, further comprising:descrambling the configuration information based at least in part on agroup specific radio network temporary identifier (RNTI) associated withmultiple connection-states of the UE, wherein the multipleconnection-states include a radio resource control (RRC) idle mode andan RRC inactive mode.

Example 5: The method of example 4, further comprising: receiving secondconfiguration information for the first message of the two-step randomaccess procedure, wherein the second configuration information comprisesa second connection-state element indicating that the secondconfiguration information corresponds to a second connection-state ofthe UE different from the connection-state of the UE; and descramblingthe second configuration information based at least in part on a secondgroup specific RNTI associated with the second connection-state of theUE.

Example 6: The method of any of examples 1 to 5, wherein theconfiguration information comprises preamble resource information,physical uplink shared channel (PUSCH) resource information, transportblock size (TBS), modulation and coding scheme (MCS), waveform,demodulation reference signal (DMRS) resource information, a mapping ofa preamble to a PUSCH resource unit (PRU), an association between asynchronization signal block (SSB) and preamble occasion (RO) or PUSCHoccasion (PO), or any combination thereof.

Example 7: The method of any of examples 1 to 6, further comprising:descrambling the configuration information based at least in part on agroup specific radio network temporary identifier (RNTI) associated withmultiple connection-states of the UE, wherein the multipleconnection-states include a radio resource control (RRC) inactive modeand an RRC connected mode.

Example 8: The method of example 7, further comprising: receiving secondconfiguration information for the first message of the two-step randomaccess procedure, wherein the second configuration information comprisesa second connection-state element indicating that the secondconfiguration information corresponds to a second connection-state ofthe UE different from the current connection-state of the UE;descrambling the second configuration information based at least in parton a second group specific RNTI associated with the secondconnection-state of the UE; selecting a value for a preamble resource,physical uplink shared channel (PUSCH) resource, transport block size(TBS), modulation and coding scheme (MCS), waveform, demodulationreference signal (DMRS) resource, a preamble to a PUSCH resource unit(PRU) mapping, an synchronization signal block (SSB) to preambleoccasion (RO) or PUSCH occasion (PO) association, from a union of thefirst and the second configuration information, from the secondconfiguration information only, or from the first configurationinformation only; and applying the selected value to the first messageof the two-step random access procedure for transmitting the firstmessage to the base station.

Example 9: The method of example 8, further comprising: transmitting thefirst message of the two-step random access procedure according to atleast a portion of the second configuration information.

Example 10: The method of any of examples 1 to 9, further comprising:receiving the configuration information for the first message via afirst signal; and receiving a second signal different from the firstsignal, the second signal comprising second configuration informationfor the first message of the two-step random access procedure, whereinthe second configuration information comprises a second connection-stateelement indicating that the second configuration information correspondsto a second connection-state of the UE different from the currentconnection-state of the UE.

Example 11: The method of example 10, wherein the second configurationinformation corresponds to multiple connection-states of the UE, each ofwhich is different from the current connection-state of the UE.

Example 12: The method of any of examples 1 to 11, further comprising:receiving second configuration information for the first message of thetwo-step random access procedure, wherein the second configurationinformation comprises a second connection-state element indicating thatthe second configuration information corresponds to a secondconnection-state of the UE different from the current connection-stateof the UE; and transmitting the first message of the two-step randomaccess procedure according to at least a portion of the secondconfiguration information.

Example 13: The method of example 12, wherein preamble resourceinformation of the first configuration information at least partiallyoverlaps preamble resource information of the second configurationinformation, or physical uplink shared channel (PUSCH) resourceinformation of the first configuration information at least partiallyoverlaps PUSCH resource information of the second configurationinformation, or demodulation reference signal (DMRS) resourceinformation of the first configuration information at least partiallyoverlaps DMRS resource information of the second configurationinformation, or transport block size (TBS) information of the firstconfiguration information at least partially overlaps TBS information ofthe second configuration information, modulation and coding scheme (MCS)information of the first configuration information at least partiallyoverlaps MCS information of the second configuration information, or amapping relation between preamble and PUSCH resource unit (PRU) of thefirst configuration information at least partially overlaps the mappingrelation between preamble and PRU of the second configurationinformation, or an association pattern between synchronization signalblock (SSB) and preamble resource occasion (RO) or PUSCH occasion (PO)of the first configuration information at least partially overlaps theassociation pattern between SSB and preamble RO or PUSCH PO of thesecond configuration information.

Example 14: The method of example 12, further comprising: receiving thesecond configuration information in a signal different from the firstconfiguration information while UE is in the current connected state;decoding both the second configuration information and the firstconfiguration information; and transmitting, by the UE in the currentconnected-state, the first message based at least in part on only one ofthe first configuration information or the second configurationinformation.

Example 15: The method of example 12, further comprising: failing todecode the first configuration information while the UE is in thecurrent connected-state; and transmitting, by the UE in the currentconnected-state, the first message based at least in part on the secondconfiguration information corresponding to the second connection-stateof the UE.

Example 16: The method of any of examples 1 to 15, further comprising:receiving system information that indicates second configurationinformation for the first message of the two-step random accessprocedure, wherein the second configuration information comprises asecond connection-state element indicating that the second configurationinformation corresponds to a second connection-state of the UE differentfrom the connection-state of the UE; receiving radio resource control(RRC) signaling that comprises the configuration informationcorresponding to the second connection-state of the UE; and transmittingthe first message of the two-step random access procedure according tothe configuration information independent of the system information.

Example 17: The method of any of examples 1 to 16, further comprising:determining the current connection-state of the UE as one of a radioresource control (RRC) idle mode, an RRC inactive mode, or an RRCconnected mode.

Example 18: The method of any of examples 1 to 17, further comprising:receiving the configuration information via a synchronization signalblock (SSB), a system information block (SIB), a paging message, a radioresource control (RRC) message, or any combination thereof.

Example 19: A method for wireless communications at a base station,comprising: transmitting, to a user equipment (UE), configurationinformation for a first message of a two-step random access procedurebetween the UE and the base station, the configuration informationcomprising a connection-state element indicating that the configurationinformation corresponds to a connection-state of the UE; receiving, fromthe UE and based at least in part on a current connection-state of theUE being the connection-state of the UE to which the configurationinformation corresponds, the first message of the two-step random accessprocedure; and transmitting a second message of the two-step randomaccess procedure to the UE in response to the first message.

Example 20: The method of example 19, further comprising: scrambling theconfiguration information based at least in part on a connection-statespecific radio network temporary identifier (RNTI), wherein theconnection-state specific RNTI is associated with one of a radioresource control (RRC) idle mode, an RRC inactive mode, or an RRCconnected mode; and scrambling second configuration information for thefirst message of the two-step random access procedure based at least inpart on a second connection-state specific RNTI different from theconnection-state specific RNTI, wherein the second configurationinformation comprises a second connection-state element indicating thatthe second configuration information corresponds to a secondconnection-state of the UE different from the connection-state of theUE.

Example 21: The method of any of examples 19 to 20, further comprising:scrambling the configuration information based at least in part on agroup specific radio network temporary identifier (RNTI), wherein thegroup specific RNTI is associated with both a radio resource control(RRC) idle mode and an RRC inactive mode.

Example 22: The method of any of examples 19 to 21, further comprising:scrambling the configuration information based at least in part on agroup specific radio network temporary identifier (RNTI), wherein thegroup specific RNTI is associated with both a radio resource control(RRC) inactive mode and an RRC connected mode.

Example 23: The method of any of examples 19 to 22, further comprising:transmitting the configuration information for the first message via afirst signal; and transmitting a second signal different from the firstsignal, the second signal comprising second configuration informationfor the first message of the two-step random access procedure, whereinthe second configuration information comprises a second connection-stateelement indicating that the second configuration information correspondsto a second connection-state of the UE different from theconnection-state of the UE.

Example 24: The method of example 23, wherein the second configurationinformation corresponds to multiple connection-states of the UE, and thesecond configuration information is different from the firstconfiguration information for transport block size (TBS), modulation andcoding scheme (MCS), demodulation reference signal (DMRS) resource,preamble resource, physical uplink shared channel (PUSCH) resource,preamble to PUSCH resource unit (PRU) mapping, synchronization signalblock (SSB) to preamble resource occasion (RO) or PUSCH occasion (PO)association, or any combination thereof.

Example 25: The method of any of examples 19 to 24, wherein a preambleresource of the first configuration information overlaps a preambleresource of a second configuration information, wherein the secondconfiguration information comprises a second connection-state elementindicating that the second configuration information corresponds to asecond connection-state of the UE different from the currentconnection-state of the UE.

Example 26: The method of any of examples 19 to 25, wherein one ormultiple values of the first configuration information overlaps with oneor multiple values of a second configuration information for transportblock size (TBS), modulation and coding scheme (MCS), demodulationreference signal (DMRS) resource, preamble resource, physical uplinkshared channel (PUSCH) resource, preamble to PUSCH resource unit (PRU)mapping, synchronization signal block (SSB) to preamble resourceoccasion (RO) or PUSCH occasion (PO) association, or any combinationthereof, and wherein the second configuration information comprises asecond connection-state element indicating that the second configurationinformation corresponds to a second connection-state of the UE differentfrom the current connection-state of the UE.

Example 27: The method of any of examples 19 to 26, wherein the currentconnection-state of the UE as one of a radio resource control (RRC) idlemode, an RRC inactive mode, or an RRC connected mode.

Example 28: The method of any of examples 19 to 27, further comprising:transmitting the configuration information via a synchronization signalblock (SSB), a system information block (SIB), a paging message, a radioresource control (RRC) message, or any combination thereof.

Example 29. The method of any of examples 19 to 28, wherein theconfiguration information comprises preamble resource information,physical uplink shared channel (PUSCH) resource information, transportblock size (TBS), modulation and coding scheme (MCS), waveform,demodulation reference signal (DMRS) resource information, a mapping ofa preamble to a PUSCH resource unit (PRU), an association between asynchronization signal block (SSB) and preamble occasion (RO) or PUSCHoccasion (PO), or any combination thereof.

Example 30: An apparatus comprising at least one means for performing amethod of any of examples 1 to 18.

Example 31: An apparatus comprising at least one means for performing amethod of any of examples 19 to 29.

Example 32: An apparatus for wireless communications comprising aprocessor; memory in electronic communication with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to perform a method of any of examples 1 to 18.

Example 33: An apparatus for wireless communications comprising aprocessor; memory in electronic communication with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to perform a method of any of examples 19 to 29.

Example 34: A non-transitory computer-readable medium storing code forwireless communications, the code comprising instructions executable bya processor to perform a method of any of examples 1 to 18.

Example 35: A non-transitory computer-readable medium storing code forwireless communications, the code comprising instructions executable bythe processor to perform a method of any of examples 19 to 29.

Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may bedescribed for purposes of example, and LTE, LTE-A, LTE-A Pro, or NRterminology may be used in much of the description, the techniquesdescribed herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NRnetworks. For example, the described techniques may be applicable tovarious other wireless communications systems such as Ultra MobileBroadband (UMB), Institute of Electrical and Electronics Engineers(IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, aswell as other systems and radio technologies not explicitly mentionedherein.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the description may be represented byvoltages, currents, electromagnetic waves, magnetic fields or particles,optical fields or particles, or any combination thereof.

The various illustrative blocks and components described in connectionwith the disclosure herein may be implemented or performed with ageneral-purpose processor, a DSP, an ASIC, a CPU, an FPGA or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described herein. A general-purpose processor may be amicroprocessor, but in the alternative, the processor may be anyprocessor, controller, microcontroller, or state machine. A processormay also be implemented as a combination of computing devices (e.g., acombination of a DSP and a microprocessor, multiple microprocessors, oneor more microprocessors in conjunction with a DSP core, or any othersuch configuration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described herein may be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations.

Computer-readable media includes both non-transitory computer storagemedia and communication media including any medium that facilitatestransfer of a computer program from one place to another. Anon-transitory storage medium may be any available medium that may beaccessed by a general-purpose or special-purpose computer. By way ofexample, and not limitation, non-transitory computer-readable media mayinclude RAM, ROM, electrically erasable programmable ROM (EEPROM), flashmemory, compact disk (CD) ROM or other optical disk storage, magneticdisk storage or other magnetic storage devices, or any othernon-transitory medium that may be used to carry or store desired programcode means in the form of instructions or data structures and that maybe accessed by a general-purpose or special-purpose computer, or ageneral-purpose or special-purpose processor. Also, any connection isproperly termed a computer-readable medium. For example, if the softwareis transmitted from a website, server, or other remote source using acoaxial cable, fiber optic cable, twisted pair, digital subscriber line(DSL), or wireless technologies such as infrared, radio, and microwave,then the coaxial cable, fiber optic cable, twisted pair, DSL, orwireless technologies such as infrared, radio, and microwave areincluded in the definition of computer-readable medium. Disk and disc,as used herein, include CD, laser disc, optical disc, digital versatiledisc (DVD), floppy disk and Blu-ray disc where disks usually reproducedata magnetically, while discs reproduce data optically with lasers.Combinations of the above are also included within the scope ofcomputer-readable media.

As used herein, including in the claims, “or” as used in a list of items(e.g., a list of items prefaced by a phrase such as “at least one of” or“one or more of”) indicates an inclusive list such that, for example, alist of at least one of A, B, or C means A or B or C or AB or AC or BCor ABC (i.e., A and B and C). Also, as used herein, the phrase “basedon” shall not be construed as a reference to a closed set of conditions.For example, an example step that is described as “based on condition A”may be based on both a condition A and a condition B without departingfrom the scope of the present disclosure. In other words, as usedherein, the phrase “based on” shall be construed in the same manner asthe phrase “based at least in part on.”

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label, or othersubsequent reference label.

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “example” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details forthe purpose of providing an understanding of the described techniques.These techniques, however, may be practiced without these specificdetails. In some instances, known structures and devices are shown inblock diagram form in order to avoid obscuring the concepts of thedescribed examples.

The description herein is provided to enable a person having ordinaryskill in the art to make or use the disclosure. Various modifications tothe disclosure will be apparent to a person having ordinary skill in theart, and the generic principles defined herein may be applied to othervariations without departing from the scope of the disclosure. Thus, thedisclosure is not limited to the examples and designs described herein,but is to be accorded the broadest scope consistent with the principlesand novel features disclosed herein.

What is claimed is:
 1. An apparatus for wireless communications at auser equipment (UE), comprising: a processor, memory coupled with theprocessor; and instructions stored in the memory and executable by theprocessor to cause the apparatus to: receive, from an access networkentity and via a first signal, first configuration information for afirst message of a two-step random access procedure between the UE andthe access network entity, the first configuration informationcomprising a connection-state dependent element indicating that thefirst configuration information corresponds to a currentconnection-state of the UE; receive, from the access network entity andvia a second signal different from the first signal, secondconfiguration information for the first message of the two-step randomaccess procedure, wherein the second configuration information comprisesa second connection-state dependent element indicating that the secondconfiguration information corresponds to a second connection-state ofthe UE different from the current connection-state of the UE; transmit,to the access network entity and based at least in part on a currentconnection-state of the UE being the current connection-state of the UEto which the first configuration information corresponds, the firstmessage of the two-step random access procedure; and monitor for asecond message of the two-step random access procedure from the accessnetwork entity in response to the first message.
 2. The apparatus ofclaim 1, wherein the second configuration information corresponds tomultiple connection-states of the UE, each of which is different fromthe current connection-state of the UE.
 3. The apparatus of claim 1,wherein the instructions executable by the processor to transmit thefirst message of the two-step random access procedure compriseinstruction executable by the processor to: transmit the first messageof the two-step random access procedure according to at least a portionof the second configuration information.
 4. The apparatus of claim 3,wherein preamble resource information of the first configurationinformation at least partially overlaps preamble resource information ofthe second configuration information, or physical uplink shared channel(PUSCH) resource information of the first configuration information atleast partially overlaps PUSCH resource information of the secondconfiguration information, or demodulation reference signal (DMRS)resource information of the first configuration information at leastpartially overlaps DMRS resource information of the second configurationinformation, or transport block size (TBS) information of the firstconfiguration information at least partially overlaps TBS information ofthe second configuration information, modulation and coding scheme (MCS)information of the first configuration information at least partiallyoverlaps MCS information of the second configuration information, or amapping relation between preamble and PUSCH resource unit (PRU) of thefirst configuration information at least partially overlaps the mappingrelation between preamble and PRU of the second configurationinformation, or an association pattern between synchronization signalblock (SSB) and preamble resource occasion (RO) or PUSCH occasion (PO)of the first configuration information at least partially overlaps theassociation pattern between SSB and preamble RO or PUSCH PO of thesecond configuration information.
 5. The apparatus of claim 3, whereinthe instructions are further executable by the processor to: decode boththe second configuration information and the first configurationinformation; and transmit, by the UE in the current connected-state, thefirst message based at least in part on only one of the firstconfiguration information or the second configuration information. 6.The apparatus of claim 3, wherein the instructions are furtherexecutable by the processor to: fail to decode the first configurationinformation while the UE is in the current connected-state; andtransmit, by the UE in the current connected-state, the first messagebased at least in part on the second configuration informationcorresponding to the second connection-state of the UE.
 7. The apparatusof claim 1, wherein the instructions are further executable by theprocessor to: descramble the first configuration information based atleast in part on a group specific radio network temporary identifier(RNTI) associated with multiple connection-states of the UE, wherein themultiple connection-states include a radio resource control (RRC) idlemode and an RRC inactive mode.
 8. The apparatus of claim 7, wherein theinstructions are further executable by the processor to: descramble thesecond configuration information based at least in part on a secondgroup specific RNTI associated with the second connection-state of theUE.
 9. The apparatus of claim 1, wherein the instructions executable bythe processor to receive the first configuration information compriseinstructions executable by the processor to: descramble the firstconfiguration information based at least in part on a connection-statespecific radio network temporary identifier (RNTI) associated with thecurrent connection-state of the UE, wherein the current connection-stateof the UE is one of a radio resource control (RRC) idle mode, an RRCinactive mode, or an RRC connected mode.
 10. The apparatus of claim 9,wherein the instructions are further executable by the processor to:descramble the second configuration information based at least in parton a second connection-state specific RNTI associated with the secondconnection-state of the UE.
 11. The apparatus of claim 10, wherein theinstructions are further executable by the processor to: select a valuefor a preamble resource, physical uplink shared channel (PUSCH)resource, transport block size (TBS), modulation and coding scheme(MCS), waveform, demodulation reference signal (DMRS) resource, apreamble to a PUSCH resource unit (PRU) mapping, an synchronizationsignal block (SSB) to preamble occasion (RO) or PUSCH occasion (PO)association, from a union of the first and the second configurationinformation, from the second configuration information only, or from thefirst configuration information only; and apply the selected value tothe first message of the two-step random access procedure fortransmitting the first message to the access network entity.
 12. Theapparatus of claim 1, wherein the first configuration informationcomprises preamble resource information, physical uplink shared channel(PUSCH) resource information, transport block size (TBS), modulation andcoding scheme (MCS), waveform, demodulation reference signal (DMRS)resource information, a mapping of a preamble to a PUSCH resource unit(PRU), an association between a synchronization signal block (SSB) andpreamble occasion (RO) or PUSCH occasion (PO), or any combinationthereof.
 13. The apparatus of claim 1, wherein the instructions arefurther executable by the processor to: determine the currentconnection-state of the UE as one of a radio resource control (RRC) idlemode, an RRC inactive mode, or an RRC connected mode.
 14. The apparatusof claim 1, wherein the instructions are further executable by theprocessor to: receive the first configuration information via asynchronization signal block (SSB), a system information block (SIB), apaging message, a radio resource control (RRC) message, or anycombination thereof.
 15. The apparatus of claim 1, wherein theinstructions are further executable by the processor to: receive thesecond configuration information via a synchronization signal block(SSB), a system information block (SIB), a paging message, a radioresource control (RRC) message, or any combination thereof.
 16. Anapparatus for wireless communications at an access network entity,comprising: a processor, memory coupled with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to: transmit, to a user equipment (UE) and via afirst signal, first configuration information for a first message of atwo-step random access procedure between the UE and the access networkentity, the first configuration information comprising aconnection-state dependent element indicating that the firstconfiguration information corresponds to a current connection-state ofthe UE; transmit, to the UE and via a second signal different from thefirst signal, second configuration information for the first message ofthe two-step random access procedure, wherein the second configurationinformation comprises a second connection-state dependent elementindicating that the second configuration information corresponds to asecond connection-state of the UE different from the currentconnection-state of the UE; receive, from the UE and based at least inpart on a current connection-state of the UE being the currentconnection-state of the UE to which the first configuration informationcorresponds, the first message of the two-step random access procedure;and transmit a second message of the two-step random access procedure tothe UE in response to the first message.
 17. The apparatus of claim 16,wherein the second configuration information corresponds to multipleconnection-states of the UE, and the second configuration information isdifferent from the first configuration information for transport blocksize (TBS), modulation and coding scheme (MCS), demodulation referencesignal (DMRS) resource, preamble resource, physical uplink sharedchannel (PUSCH) resource, preamble to PUSCH resource unit (PRU) mapping,synchronization signal block (SSB) to preamble resource occasion (RO) orPUSCH occasion (PO) association, or any combination thereof.
 18. Theapparatus of claim 16, wherein a preamble resource of the firstconfiguration information overlaps a preamble resource of the secondconfiguration information.
 19. The apparatus of claim 16, wherein one ormultiple values of the first configuration information overlaps with oneor multiple values of a second configuration information for transportblock size (TBS), modulation and coding scheme (MCS), demodulationreference signal (DMRS) resource, preamble resource, physical uplinkshared channel (PUSCH) resource, preamble to PUSCH resource unit (PRU)mapping, synchronization signal block (SSB) to preamble resourceoccasion (RO) or PUSCH occasion (PO) association, or any combinationthereof, and wherein the second configuration information comprises asecond connection-state dependent element indicating that the secondconfiguration information corresponds to a second connection-state ofthe UE different from the current connection-state of the UE.
 20. Theapparatus of claim 16, wherein the instructions executable by theprocessor to receive the first message of the two-step random accessprocedure comprise instructions executable by the processor to: receivethe first message of the two-step random access procedure according toat least a portion of the second configuration information.
 21. Theapparatus of claim 16, wherein the instructions are further executableby the processor to: scramble the first configuration information basedat least in part on a group specific radio network temporary identifier(RNTI) associated with multiple connection-states of the UE, wherein themultiple connection-states include a radio resource control (RRC) idlemode and an RRC inactive mode.
 22. The apparatus of claim 21, whereinthe instructions are further executable by the processor to: scramblethe second configuration information based at least in part on a secondgroup specific RNTI associated with the second connection-state of theUE.
 23. The apparatus of claim 16, wherein the instructions are furtherexecutable by the processor to: scramble the first configurationinformation based at least in part on a connection-state specific radionetwork temporary identifier (RNTI) associated with the currentconnection-state of the UE, wherein the current connection-state of theUE is one of a radio resource control (RRC) idle mode, an RRC inactivemode, or an RRC connected mode.
 24. The apparatus of claim 23, whereinthe instructions are further executable by the processor to: scramblethe second configuration information based at least in part on a secondconnection-state specific RNTI associated with the secondconnection-state of the UE.
 25. The apparatus of claim 16, wherein theinstructions are further executable by the processor to: determine thecurrent connection-state of the UE as one of a radio resource control(RRC) idle mode, an RRC inactive mode, or an RRC connected mode.
 26. Theapparatus of claim 16, wherein the first configuration informationcomprises preamble resource information, physical uplink shared channel(PUSCH) resource information, transport block size (TBS), modulation andcoding scheme (MCS), waveform, demodulation reference signal (DMRS)resource information, a mapping of a preamble to a PUSCH resource unit(PRU), an association between a synchronization signal block (SSB) andpreamble occasion (RO) or PUSCH occasion (PO), or any combinationthereof.
 27. The apparatus of claim 16, wherein the instructions arefurther executable by the processor to: transmit the first configurationinformation via a synchronization signal block (SSB), a systeminformation block (SIB), a paging message, a radio resource control(RRC) message, or any combination thereof.
 28. The apparatus of claim16, wherein the instructions are further executable by the processor to:transmit the second configuration information via a synchronizationsignal block (SSB), a system information block (SIB), a paging message,a radio resource control (RRC) message, or any combination thereof. 29.A method for wireless communications at a user equipment (UE),comprising: receiving, from an access network entity and via a firstsignal, first configuration information for a first message of atwo-step random access procedure between the UE and the access networkentity, the first configuration information comprising aconnection-state dependent element indicating that the firstconfiguration information corresponds to a current connection-state ofthe UE; receiving, from the access network entity and via a secondsignal different from the first signal, second configuration informationfor the first message of the two-step random access procedure, whereinthe second configuration information comprises a second connection-statedependent element indicating that the second configuration informationcorresponds to a second connection-state of the UE different from thecurrent connection-state of the UE; transmitting, to the access networkentity and based at least in part on a current connection-state of theUE being the current connection-state of the UE to which the firstconfiguration information corresponds, the first message of the two-steprandom access procedure; and monitoring for a second message of thetwo-step random access procedure from the access network entity inresponse to the first message.
 30. A method for wireless communicationsat an access network entity, comprising: transmitting, to a userequipment (UE) and via a first signal, first configuration informationfor a first message of a two-step random access procedure between the UEand the access network entity, the first configuration informationcomprising a connection-state dependent element indicating that thefirst configuration information corresponds to a currentconnection-state of the UE; transmitting, to the UE and via a secondsignal different from the first signal, second configuration informationfor the first message of the two-step random access procedure, whereinthe second configuration information comprises a second connection-statedependent element indicating that the second configuration informationcorresponds to a second connection-state of the UE different from thecurrent connection-state of the UE; receiving, from the UE and based atleast in part on a current connection-state of the UE being the currentconnection-state of the UE to which the first configuration informationcorresponds, the first message of the two-step random access procedure;and transmitting a second message of the two-step random accessprocedure to the UE in response to the first message.